diff --git a/SConstruct b/SConstruct
index ee682b9a8..625dfe3a7 100644
--- a/SConstruct
+++ b/SConstruct
@@ -377,11 +377,6 @@ config_options = [
         'sphinx_cmd',
         """Command to use for building the Sphinx documentation.""",
         'sphinx-build', PathVariable.PathAccept),
-    BoolVariable(
-        'with_h298modify_capability',
-        """Enable changing the 298K heats of formation directly via
-           the C++ layer.""",
-        False),
     EnumVariable(
         'use_sundials',
         """Cantera uses the CVODE or CVODES ODE integrator to time-integrate
@@ -1144,8 +1139,6 @@ if env.get('has_sundials_lapack') and not env['BUILD_BLAS_LAPACK']:
 else:
     configh['SUNDIALS_USE_LAPACK'] = 0
 
-cdefine('H298MODIFY_CAPABILITY', 'with_h298modify_capability')
-
 cdefine('LAPACK_FTN_STRING_LEN_AT_END', 'lapack_ftn_string_len_at_end')
 cdefine('LAPACK_FTN_TRAILING_UNDERSCORE', 'lapack_ftn_trailing_underscore')
 cdefine('FTN_TRAILING_UNDERSCORE', 'lapack_ftn_trailing_underscore')
diff --git a/include/cantera/base/config.h.in b/include/cantera/base/config.h.in
index a14c5810d..afbf13b8d 100644
--- a/include/cantera/base/config.h.in
+++ b/include/cantera/base/config.h.in
@@ -104,10 +104,6 @@ typedef  int          ftnlen;       // Fortran hidden string length type
 
 //-------------- Optional Cantera Capabilities ----------------------
 
-//    Enable sensitivity analysis via changing H298 directly
-//    for species
-%(H298MODIFY_CAPABILITY)s
-
 //    Enable Sundials to use an external BLAS/LAPACK library if it was
 //    built to use this option
 %(SUNDIALS_USE_LAPACK)s
diff --git a/include/cantera/thermo/GeneralSpeciesThermo.h b/include/cantera/thermo/GeneralSpeciesThermo.h
index 68c36ab99..df51e4ece 100644
--- a/include/cantera/thermo/GeneralSpeciesThermo.h
+++ b/include/cantera/thermo/GeneralSpeciesThermo.h
@@ -123,14 +123,10 @@ public:
                               doublereal& maxTemp,
                               doublereal& refPressure) const;
 
-#ifdef H298MODIFY_CAPABILITY
-
     virtual doublereal reportOneHf298(int k) const;
 
     virtual void modifyOneHf298(const int k, const doublereal Hf298New);
 
-#endif
-
 private:
     //! Provide the SpeciesthermoInterpType object
     /*!
diff --git a/include/cantera/thermo/IdealGasPhase.h b/include/cantera/thermo/IdealGasPhase.h
index e65150225..0d0523a3e 100644
--- a/include/cantera/thermo/IdealGasPhase.h
+++ b/include/cantera/thermo/IdealGasPhase.h
@@ -768,13 +768,10 @@ public:
      */
     virtual void getEnthalpy_RT_ref(doublereal* hrt) const;
 
-#ifdef H298MODIFY_CAPABILITY
-
     virtual void modifyOneHf298SS(const size_t& k, const doublereal Hf298New) {
         m_spthermo->modifyOneHf298(k, Hf298New);
         m_tlast += 0.0001234;
     }
-#endif
     //!  Returns the vector of nondimensional
     //!  Gibbs Free Energies of the reference state at the current temperature
     //!  of the solution and the reference pressure for the species.
diff --git a/include/cantera/thermo/LatticePhase.h b/include/cantera/thermo/LatticePhase.h
index 56e6744aa..8818446e8 100644
--- a/include/cantera/thermo/LatticePhase.h
+++ b/include/cantera/thermo/LatticePhase.h
@@ -733,8 +733,6 @@ public:
     /// @name Thermodynamic Values for the Species Reference States
     //@{
 
-#ifdef H298MODIFY_CAPABILITY
-
     //! Modify the value of the 298 K Heat of Formation of one species in the phase (J kmol-1)
     /*!
      *   The 298K heat of formation is defined as the enthalpy change to create the standard state
@@ -747,7 +745,6 @@ public:
         m_spthermo->modifyOneHf298(k, Hf298New);
         m_tlast += 0.0001234;
     }
-#endif
 
     //! Returns the vector of nondimensional
     //!  Enthalpies of the reference state at the current temperature
diff --git a/include/cantera/thermo/LatticeSolidPhase.h b/include/cantera/thermo/LatticeSolidPhase.h
index 387308e87..d8d380604 100644
--- a/include/cantera/thermo/LatticeSolidPhase.h
+++ b/include/cantera/thermo/LatticeSolidPhase.h
@@ -624,8 +624,6 @@ public:
      */
     void setLatticeMoleFractionsByName(int n, const std::string& x);
 
-#ifdef H298MODIFY_CAPABILITY
-
     //! Modify the value of the 298 K Heat of Formation of one species in the phase (J kmol-1)
     /*!
      *   The 298K heat of formation is defined as the enthalpy change to create the standard state
@@ -635,7 +633,6 @@ public:
      *   @param  Hf298New    Specify the new value of the Heat of Formation at 298K and 1 bar
      */
     virtual void modifyOneHf298SS(const size_t& k, const doublereal Hf298New);
-#endif
 
 private:
     //! error routine
diff --git a/include/cantera/thermo/MixtureFugacityTP.h b/include/cantera/thermo/MixtureFugacityTP.h
index 4f1fc2ae7..f149927ce 100644
--- a/include/cantera/thermo/MixtureFugacityTP.h
+++ b/include/cantera/thermo/MixtureFugacityTP.h
@@ -476,7 +476,6 @@ public:
      */
     virtual void getEnthalpy_RT_ref(doublereal* hrt) const;
 
-#ifdef H298MODIFY_CAPABILITY
     //!  Modify the value of the 298 K Heat of Formation of the standard state of
     //!  one species in the phase (J kmol-1)
     /*!
@@ -488,7 +487,6 @@ public:
      *                       units = J/kmol.
      */
     void modifyOneHf298SS(const int k, const doublereal Hf298New);
-#endif
 
     //!  Returns the vector of nondimensional
     //!  Gibbs free energies of the reference state at the current temperature
diff --git a/include/cantera/thermo/NasaPoly1.h b/include/cantera/thermo/NasaPoly1.h
index 9632dac10..c6e550e08 100644
--- a/include/cantera/thermo/NasaPoly1.h
+++ b/include/cantera/thermo/NasaPoly1.h
@@ -191,8 +191,6 @@ public:
         }
     }
 
-#ifdef H298MODIFY_CAPABILITY
-
     virtual doublereal reportHf298(doublereal* const h298 = 0) const {
         double tt[6];
         double temp = 298.15;
@@ -227,8 +225,6 @@ public:
         m_coeff[0] += (delH) / GasConstant;
     }
 
-#endif
-
 protected:
     //! array of polynomial coefficients
     vector_fp m_coeff;
diff --git a/include/cantera/thermo/SimpleThermo.h b/include/cantera/thermo/SimpleThermo.h
index 21431a0d2..626d6dadb 100644
--- a/include/cantera/thermo/SimpleThermo.h
+++ b/include/cantera/thermo/SimpleThermo.h
@@ -263,7 +263,6 @@ public:
         }
     }
 
-#ifdef H298MODIFY_CAPABILITY
     virtual doublereal reportOneHf298(int k) const {
         throw CanteraError("reportHF298", "unimplemented");
     }
@@ -271,7 +270,6 @@ public:
     virtual void modifyOneHf298(const int k, const doublereal Hf298New) {
         throw CanteraError("reportHF298", "unimplemented");
     }
-#endif
 
 protected:
     //! Mapping between the species index and the vector index where the coefficients are kept
diff --git a/include/cantera/thermo/SingleSpeciesTP.h b/include/cantera/thermo/SingleSpeciesTP.h
index 5311bfaf8..1cee0413b 100644
--- a/include/cantera/thermo/SingleSpeciesTP.h
+++ b/include/cantera/thermo/SingleSpeciesTP.h
@@ -326,8 +326,6 @@ public:
     /// equation of state.
     //@{
 
-#ifdef H298MODIFY_CAPABILITY
-
     //! Modify the value of the 298 K Heat of Formation of one species in the phase (J kmol-1)
     /*!
      *   The 298K heat of formation is defined as the enthalpy change to create the standard state
@@ -340,7 +338,6 @@ public:
         m_spthermo->modifyOneHf298(k, Hf298New);
         m_tlast += 0.0001234;
     }
-#endif
 
     /*!
      *  Returns the vector of nondimensional
diff --git a/include/cantera/thermo/SpeciesThermo.h b/include/cantera/thermo/SpeciesThermo.h
index 9b400e177..05a39a8fe 100644
--- a/include/cantera/thermo/SpeciesThermo.h
+++ b/include/cantera/thermo/SpeciesThermo.h
@@ -309,7 +309,6 @@ public:
                               doublereal& maxTemp,
                               doublereal& refPressure) const =0;
 
-#ifdef H298MODIFY_CAPABILITY
     //! Report the 298 K Heat of Formation of the standard state of one species (J kmol-1)
     /*!
      *   The 298K Heat of Formation is defined as the enthalpy change to create the standard state
@@ -331,7 +330,6 @@ public:
      *                       units = J/kmol.
      */
     virtual void modifyOneHf298(const int k, const doublereal Hf298New) = 0;
-#endif
 
 };
 //@}
diff --git a/include/cantera/thermo/SpeciesThermoInterpType.h b/include/cantera/thermo/SpeciesThermoInterpType.h
index 707b5b99d..090f40400 100644
--- a/include/cantera/thermo/SpeciesThermoInterpType.h
+++ b/include/cantera/thermo/SpeciesThermoInterpType.h
@@ -266,8 +266,6 @@ public:
      */
     virtual void modifyParameters(doublereal* coeffs) {}
 
-#ifdef H298MODIFY_CAPABILITY
-
     //! Report the 298 K Heat of Formation of the standard state of one species (J kmol-1)
     /*!
      *   The 298K Heat of Formation is defined as the enthalpy change to create the standard state
@@ -290,8 +288,6 @@ public:
      */
     virtual void modifyOneHf298(const int k, const doublereal Hf298New);
 
-#endif
-
 protected:
     //!  lowest valid temperature
     doublereal m_lowT;
diff --git a/include/cantera/thermo/SpeciesThermoMgr.h b/include/cantera/thermo/SpeciesThermoMgr.h
index e9aa42580..cbd262ba0 100644
--- a/include/cantera/thermo/SpeciesThermoMgr.h
+++ b/include/cantera/thermo/SpeciesThermoMgr.h
@@ -107,8 +107,6 @@ public:
                               doublereal& maxTemp,
                               doublereal& refPressure) const;
 
-#ifdef H298MODIFY_CAPABILITY
-
     virtual doublereal reportOneHf298(int k) const {
         throw CanteraError("reportHF298", "unimplemented");
     }
@@ -117,8 +115,6 @@ public:
         throw CanteraError("reportHF298", "unimplemented");
     }
 
-#endif
-
 private:
 
     //! Thermo Type 1
diff --git a/include/cantera/thermo/StoichSubstance.h b/include/cantera/thermo/StoichSubstance.h
index d141ccfa1..4e0fdf0e8 100644
--- a/include/cantera/thermo/StoichSubstance.h
+++ b/include/cantera/thermo/StoichSubstance.h
@@ -297,13 +297,11 @@ public:
      */
     virtual void getEnthalpy_RT_ref(doublereal* hrt) const;
 
-#ifdef H298MODIFY_CAPABILITY
-
     virtual void modifyOneHf298SS(const size_t& k, const doublereal Hf298New) {
         m_spthermo->modifyOneHf298(k, Hf298New);
         m_tlast += 0.0001234;
     }
-#endif
+
     /**
      *  Returns the vector of nondimensional
      *  enthalpies of the reference state at the current temperature
diff --git a/include/cantera/thermo/SurfPhase.h b/include/cantera/thermo/SurfPhase.h
index 04e26c267..3a80a3f1c 100644
--- a/include/cantera/thermo/SurfPhase.h
+++ b/include/cantera/thermo/SurfPhase.h
@@ -511,8 +511,6 @@ public:
      */
     virtual void getEnthalpy_RT_ref(doublereal* hrt) const;
 
-#ifdef H298MODIFY_CAPABILITY
-
     //! Modify the value of the 298 K Heat of Formation of one species in the phase (J kmol-1)
     /*!
      *   The 298K heat of formation is defined as the enthalpy change to create the standard state
@@ -525,7 +523,6 @@ public:
         m_spthermo->modifyOneHf298(k, Hf298New);
         m_tlast += 0.0001234;
     }
-#endif
 
     //!  Returns the vector of nondimensional
     //!  entropies of the reference state at the current temperature
diff --git a/include/cantera/thermo/ThermoPhase.h b/include/cantera/thermo/ThermoPhase.h
index 6c7b8ff5f..97c100f73 100644
--- a/include/cantera/thermo/ThermoPhase.h
+++ b/include/cantera/thermo/ThermoPhase.h
@@ -176,8 +176,6 @@ public:
         return m_spthermo->minTemp(k);
     }
 
-#ifdef H298MODIFY_CAPABILITY
-
     //! Report the 298 K Heat of Formation of the standard state of one species (J kmol-1)
     /*!
      *   The 298K Heat of Formation is defined as the enthalpy change to create the standard state
@@ -202,33 +200,6 @@ public:
         m_spthermo->modifyOneHf298(k, Hf298New);
     }
 
-#else
-
-    //! Report the 298 K Heat of Formation of the standard state of one species (J kmol-1)
-    /*!
-     *   The 298K Heat of Formation is defined as the enthalpy change to create the standard state
-     *   of the species from its constituent elements in their standard states at 298 K and 1 bar.
-     *
-     *   @param k    species index
-     *   @return     Returns the current value of the Heat of Formation at 298K and 1 bar
-     */
-    doublereal Hf298SS(const int k) const {
-        return err("Hf298SS - H298MODIFY_CAPABILITY not compiled in");
-    }
-
-    //! Modify the value of the 298 K Heat of Formation of one species in the phase (J kmol-1)
-    /*!
-     *   The 298K heat of formation is defined as the enthalpy change to create the standard state
-     *   of the species from its constituent elements in their standard states at 298 K and 1 bar.
-     *
-     *   @param  k           Species k
-     *   @param  Hf298New    Specify the new value of the Heat of Formation at 298K and 1 bar
-     */
-    virtual void modifyOneHf298SS(const int k, const doublereal Hf298New) {
-        (void) err("Hf298SS - H298MODIFY_CAPABILITY not compiled in");
-    }
-#endif
-
     //! Maximum temperature for which the thermodynamic data for the species
     //! are valid.
     /*!
diff --git a/include/cantera/thermo/VPStandardStateTP.h b/include/cantera/thermo/VPStandardStateTP.h
index f7911aac4..79a7f525a 100644
--- a/include/cantera/thermo/VPStandardStateTP.h
+++ b/include/cantera/thermo/VPStandardStateTP.h
@@ -397,7 +397,6 @@ public:
      */
     virtual void getEnthalpy_RT_ref(doublereal* hrt) const;
 
-#ifdef H298MODIFY_CAPABILITY
     //!  Modify the value of the 298 K Heat of Formation of the standard state of
     //!  one species in the phase (J kmol-1)
     /*!
@@ -409,7 +408,6 @@ public:
      *                       units = J/kmol.
      */
     void modifyOneHf298SS(const size_t& k, const doublereal Hf298New);
-#endif
 
     //!  Returns the vector of nondimensional
     //!  Gibbs free energies of the reference state at the current temperature
diff --git a/src/thermo/ConstCpPoly.cpp b/src/thermo/ConstCpPoly.cpp
index 9a8117bc9..e3c9d762d 100644
--- a/src/thermo/ConstCpPoly.cpp
+++ b/src/thermo/ConstCpPoly.cpp
@@ -110,8 +110,6 @@ void ConstCpPoly::modifyParameters(doublereal* coeffs)
     m_logt0 = log(m_t0);
 }
 
-#ifdef H298MODIFY_CAPABILITY
-
 doublereal ConstCpPoly::reportHf298(doublereal* const h298) const
 {
     double temp = 298.15;
@@ -132,6 +130,4 @@ void ConstCpPoly::modifyOneHf298(const size_t& k, const doublereal Hf298New)
     m_h0_R += delH / GasConstant;
 }
 
-#endif
-
 }
diff --git a/src/thermo/ConstCpPoly.h b/src/thermo/ConstCpPoly.h
index 0691882ee..d5a7d28cd 100644
--- a/src/thermo/ConstCpPoly.h
+++ b/src/thermo/ConstCpPoly.h
@@ -114,10 +114,8 @@ public:
      */
     virtual void modifyParameters(doublereal* coeffs);
 
-#ifdef H298MODIFY_CAPABILITY
     virtual doublereal reportHf298(doublereal* const h298 = 0) const;
     virtual void modifyOneHf298(const size_t& k, const doublereal Hf298New);
-#endif
 
 protected:
     //! Base temperature
diff --git a/src/thermo/GeneralSpeciesThermo.cpp b/src/thermo/GeneralSpeciesThermo.cpp
index 632b4d8fb..05b30c75a 100644
--- a/src/thermo/GeneralSpeciesThermo.cpp
+++ b/src/thermo/GeneralSpeciesThermo.cpp
@@ -304,8 +304,6 @@ SpeciesThermoInterpType* GeneralSpeciesThermo::provideSTIT(size_t k)
     return m_sp[k];
 }
 
-#ifdef H298MODIFY_CAPABILITY
-
 doublereal GeneralSpeciesThermo::reportOneHf298(int k) const
 {
     SpeciesThermoInterpType* sp_ptr = m_sp[k];
@@ -324,6 +322,4 @@ void GeneralSpeciesThermo::modifyOneHf298(const int k, const doublereal Hf298New
     }
 }
 
-#endif
-
 }
diff --git a/src/thermo/LatticeSolidPhase.cpp b/src/thermo/LatticeSolidPhase.cpp
index e295c5874..032bff74b 100644
--- a/src/thermo/LatticeSolidPhase.cpp
+++ b/src/thermo/LatticeSolidPhase.cpp
@@ -512,7 +512,6 @@ void LatticeSolidPhase::setParametersFromXML(const XML_Node& eosdata)
 
 }
 
-#ifdef H298MODIFY_CAPABILITY
 void LatticeSolidPhase::modifyOneHf298SS(const size_t& k, const doublereal Hf298New)
 {
     for (size_t n = 0; n < m_nlattice; n++) {
@@ -525,7 +524,6 @@ void LatticeSolidPhase::modifyOneHf298SS(const size_t& k, const doublereal Hf298
     m_tlast += 0.0001234;
     _updateThermo();
 }
-#endif
 
 doublereal LatticeSolidPhase::err(const std::string& msg) const
 {
diff --git a/src/thermo/MixtureFugacityTP.cpp b/src/thermo/MixtureFugacityTP.cpp
index e55750795..3916c5624 100644
--- a/src/thermo/MixtureFugacityTP.cpp
+++ b/src/thermo/MixtureFugacityTP.cpp
@@ -147,13 +147,11 @@ void MixtureFugacityTP::getEnthalpy_RT(doublereal* hrt) const
     getEnthalpy_RT_ref(hrt);
 }
 
-#ifdef H298MODIFY_CAPABILITY
 void MixtureFugacityTP::modifyOneHf298SS(const int k, const doublereal Hf298New)
 {
     m_spthermo->modifyOneHf298(k, Hf298New);
     m_Tlast_ref += 0.0001234;
 }
-#endif
 
 void MixtureFugacityTP::getEntropy_R(doublereal* sr) const
 {
diff --git a/src/thermo/NasaPoly2.h b/src/thermo/NasaPoly2.h
index 6ee448b34..68fa557a1 100644
--- a/src/thermo/NasaPoly2.h
+++ b/src/thermo/NasaPoly2.h
@@ -165,8 +165,6 @@ public:
         }
     }
 
-#ifdef H298MODIFY_CAPABILITY
-
     doublereal reportHf298(doublereal* const h298 = 0) const {
         double h;
         if (298.15 <= m_midT) {
@@ -195,8 +193,6 @@ public:
         mnp_high.modifyOneHf298(k, hnew);
     }
 
-#endif
-
 protected:
     //! Midrange temperature
     doublereal m_midT;
diff --git a/src/thermo/NasaThermo.cpp b/src/thermo/NasaThermo.cpp
index fd601aea9..ea87cf185 100644
--- a/src/thermo/NasaThermo.cpp
+++ b/src/thermo/NasaThermo.cpp
@@ -209,7 +209,6 @@ void NasaThermo::reportParams(size_t index, int& type,
     }
 }
 
-#ifdef H298MODIFY_CAPABILITY
 doublereal NasaThermo::reportOneHf298(const int k) const
 {
     int grp = m_group_map[k];
@@ -252,7 +251,6 @@ void NasaThermo::modifyOneHf298(const int k, const doublereal Hf298New)
         nlow->modifyOneHf298(k, hnew);
     }
 }
-#endif
 
 doublereal NasaThermo::cp_R(double t, const doublereal* c)
 {
diff --git a/src/thermo/NasaThermo.h b/src/thermo/NasaThermo.h
index 037eb52b1..62ddaab2e 100644
--- a/src/thermo/NasaThermo.h
+++ b/src/thermo/NasaThermo.h
@@ -145,10 +145,8 @@ public:
                               doublereal& maxTemp,
                               doublereal& refPressure) const;
 
-#ifdef H298MODIFY_CAPABILITY
     virtual doublereal reportOneHf298(const int k) const;
     virtual void modifyOneHf298(const int k, const doublereal Hf298New);
-#endif
 
     //! Initialized to the type of parameterization
     /*!
diff --git a/src/thermo/ShomatePoly.h b/src/thermo/ShomatePoly.h
index 0fdb25738..bb0d840be 100644
--- a/src/thermo/ShomatePoly.h
+++ b/src/thermo/ShomatePoly.h
@@ -219,8 +219,6 @@ public:
         std::copy(coeffs, coeffs + 7, m_coeff.begin());
     }
 
-#ifdef H298MODIFY_CAPABILITY
-
     virtual doublereal reportHf298(doublereal* const h298 = 0) const {
         double tPoly[4];
         doublereal tt = 1.e-3*298.15;
@@ -251,8 +249,6 @@ public:
         m_coeff[5] += delH / 1.0E6;
     }
 
-#endif
-
 protected:
     //! Array of coeffcients
     vector_fp m_coeff;
@@ -467,8 +463,6 @@ public:
         msp_high = new ShomatePoly(m_index, m_midT, m_highT, m_Pref, coeffs+8);
     }
 
-#ifdef H298MODIFY_CAPABILITY
-
     virtual doublereal reportHf298(doublereal* const h298 = 0) const {
         doublereal h;
         if (298.15 <= m_midT) {
@@ -497,8 +491,6 @@ public:
         msp_high->modifyOneHf298(k, hnew);
     }
 
-#endif
-
 protected:
     //! Midrange temperature (kelvin)
     doublereal m_midT;
diff --git a/src/thermo/ShomateThermo.h b/src/thermo/ShomateThermo.h
index 53c284a33..4a7942044 100644
--- a/src/thermo/ShomateThermo.h
+++ b/src/thermo/ShomateThermo.h
@@ -328,8 +328,6 @@ public:
         }
     }
 
-#ifdef H298MODIFY_CAPABILITY
-
     virtual doublereal reportOneHf298(int k) const {
         doublereal h;
         doublereal t = 298.15;
@@ -376,7 +374,6 @@ public:
 
     }
 
-#endif
 protected:
     //! Vector of vector of NasaPoly1's for the high temp region.
     /*!
diff --git a/src/thermo/SpeciesThermoInterpType.cpp b/src/thermo/SpeciesThermoInterpType.cpp
index 8382c52e8..4b8bf38cb 100644
--- a/src/thermo/SpeciesThermoInterpType.cpp
+++ b/src/thermo/SpeciesThermoInterpType.cpp
@@ -50,8 +50,6 @@ void SpeciesThermoInterpType::updateProperties(const doublereal* tempPoly,
     updatePropertiesTemp(T, cp_R, h_RT, s_R);
 }
 //====================================================================================================
-#ifdef H298MODIFY_CAPABILITY
-
 doublereal SpeciesThermoInterpType::reportHf298(doublereal* const h298) const
 {
     throw CanteraError("SpeciesThermoInterpType::reportHf298",
@@ -64,8 +62,6 @@ void SpeciesThermoInterpType::modifyOneHf298(const int k, const doublereal Hf298
     throw CanteraError("SpeciesThermoInterpType::modifyOneHf298",
                        "Not implemented");
 }
-
-#endif
 //====================================================================================================
 
 STITbyPDSS::STITbyPDSS()
diff --git a/src/thermo/VPStandardStateTP.cpp b/src/thermo/VPStandardStateTP.cpp
index 5b7d77945..b4c4794de 100644
--- a/src/thermo/VPStandardStateTP.cpp
+++ b/src/thermo/VPStandardStateTP.cpp
@@ -162,13 +162,11 @@ void VPStandardStateTP::getEnthalpy_RT(doublereal* hrt) const
 }
 
 //================================================================================================
-#ifdef H298MODIFY_CAPABILITY
 void VPStandardStateTP::modifyOneHf298SS(const size_t& k, const doublereal Hf298New)
 {
     m_spthermo->modifyOneHf298(k, Hf298New);
     m_Tlast_ss += 0.0001234;
 }
-#endif
 //================================================================================================
 void VPStandardStateTP::getEntropy_R(doublereal* srt) const
 {