diff --git a/src/thermo/NasaThermo.h b/src/thermo/NasaThermo.h
index 618421d4b..b07a747fc 100644
--- a/src/thermo/NasaThermo.h
+++ b/src/thermo/NasaThermo.h
@@ -162,7 +162,7 @@ public:
         vector_fp chigh(c+8, c+15);
         vector_fp clow(c+1, c+8);
 
-        checkContinuity(name, tmid, &clow[0], &chigh[0]);
+        ensureContinuity(name, tmid, &clow[0], &chigh[0]);
 
         m_high[igrp-1].push_back(NasaPoly1(index, tmid, thigh,
                                            refPressure, &chigh[0]));
@@ -460,17 +460,22 @@ protected:
     mutable std::map<size_t, std::string> m_name;
 
 private:
-    //! see SpeciesThermoFactory.cpp for the definition
+    //! Adjust polynomials to be continuous at the midpoint temperature.
     /*!
+     * Check to see if the provided coefficients are nearly continuous. Adjust
+     * the values to get more precise contintinuity to avoid convergence
+     * issues with algorithms that expect these quantities to be continuous.
+     * See SpeciesThermoFactory.cpp for the definition.
+     *
      * @param name string name of species
      * @param tmid  Mid temperature, between the two temperature regions
      * @param clow  coefficients for lower temperature region
      * @param chigh coefficients for higher temperature region
      */
-    void checkContinuity(const std::string& name, double tmid,
-                         const doublereal* clow, doublereal* chigh);
+    void ensureContinuity(const std::string& name, double tmid,
+                         doublereal* clow, doublereal* chigh);
 
-    //! for internal use by checkContinuity
+    //! for internal use by ensureContinuity
     /*!
      * @param t temperature
      * @param c coefficient array
@@ -481,7 +486,7 @@ private:
                + c[0]/t;
     }
 
-    //! for internal use by checkContinuity
+    //! for internal use by ensureContinuity
     /*!
      * @param t temperature
      * @param c coefficient array
diff --git a/src/thermo/SpeciesThermoFactory.cpp b/src/thermo/SpeciesThermoFactory.cpp
index 5e6bf3d70..4cb9ee6b0 100644
--- a/src/thermo/SpeciesThermoFactory.cpp
+++ b/src/thermo/SpeciesThermoFactory.cpp
@@ -198,8 +198,8 @@ SpeciesThermo* SpeciesThermoFactory::newSpeciesThermoManager(std::string& stype)
     return (SpeciesThermo*) 0;
 }
 
-void NasaThermo::checkContinuity(const std::string& name, double tmid,
-                                 const doublereal* clow, doublereal* chigh)
+void NasaThermo::ensureContinuity(const std::string& name, double tmid,
+                                 doublereal* clow, doublereal* chigh)
 {
     // heat capacity
     doublereal cplow = poly4(tmid, clow + 2);
@@ -215,6 +215,13 @@ void NasaThermo::checkContinuity(const std::string& name, double tmid,
                  +fp2str(cphigh)+".\n");
     }
 
+    // Adjust coefficients to eliminate any discontinuity
+    chigh[2] += 0.5 * delta;
+    clow[2] -= 0.5 * delta;
+
+    AssertThrowMsg(std::abs(poly4(tmid, clow+2) - poly4(tmid, chigh+2)) < 1e-12,
+                   "NasaThermo::ensureContinuity", "Cp/R does not match");
+
     // enthalpy
     doublereal hrtlow = enthalpy_RT(tmid, clow);
     doublereal hrthigh = enthalpy_RT(tmid, chigh);
@@ -229,6 +236,14 @@ void NasaThermo::checkContinuity(const std::string& name, double tmid,
                  +fp2str(hrthigh)+".\n");
     }
 
+    // Adjust coefficients to eliminate any discontinuity
+    chigh[0] += 0.5 * delta * tmid;
+    clow[0] -= 0.5 * delta * tmid;
+
+    AssertThrowMsg(std::abs(enthalpy_RT(tmid, clow) -
+                            enthalpy_RT(tmid, chigh)) < 1e-12,
+                   "NasaThermo::ensureContinuity", "H/RT does not match");
+
     // entropy
     doublereal srlow = entropy_R(tmid, clow);
     doublereal srhigh = entropy_R(tmid, chigh);
@@ -242,6 +257,14 @@ void NasaThermo::checkContinuity(const std::string& name, double tmid,
         writelog("\tValue computed using high-temperature polynomial: "
                  +fp2str(srhigh)+".\n");
     }
+
+    // Adjust coefficients to eliminate any discontinuity
+    chigh[1] += 0.5 * delta;
+    clow[1] -= 0.5 * delta;
+
+    AssertThrowMsg(std::abs(entropy_R(tmid, clow) -
+                            entropy_R(tmid, chigh)) < 1e-12,
+                   "NasaThermo::ensureContinuity", "S/R does not match");
 }