diff --git a/include/cantera/oneD/StFlow.h b/include/cantera/oneD/StFlow.h
index 9b39a0768..deed089bf 100644
--- a/include/cantera/oneD/StFlow.h
+++ b/include/cantera/oneD/StFlow.h
@@ -78,7 +78,12 @@ public:
     //! set the transport manager
     void setTransport(Transport& trans);
 
-    void enableSoret(bool withSoret);
+    //! Enable thermal diffusion, also known as Soret diffusion.
+    //! Requires that multicomponent transport properties be
+    //! enabled to carry out calculations.
+    void enableSoret(bool withSoret) {
+        m_do_soret = withSoret;
+    }
     bool withSoret() const {
         return m_do_soret;
     }
diff --git a/interfaces/cython/cantera/_cantera.pxd b/interfaces/cython/cantera/_cantera.pxd
index 815a0486e..d7bcd53c9 100644
--- a/interfaces/cython/cantera/_cantera.pxd
+++ b/interfaces/cython/cantera/_cantera.pxd
@@ -748,7 +748,7 @@ cdef extern from "cantera/oneD/Sim1D.h":
         void setMaxGridPoints(int, size_t) except +translate_exception
         size_t maxGridPoints(size_t) except +translate_exception
         void setGridMin(int, double) except +translate_exception
-        void setFixedTemperature(double)
+        void setFixedTemperature(double) except +translate_exception
         void setInterrupt(CxxFunc1*) except +translate_exception
         void setTimeStepCallback(CxxFunc1*)
         void setSteadyCallback(CxxFunc1*)
diff --git a/src/oneD/StFlow.cpp b/src/oneD/StFlow.cpp
index 2b08d0963..8ae383295 100644
--- a/src/oneD/StFlow.cpp
+++ b/src/oneD/StFlow.cpp
@@ -132,7 +132,7 @@ void StFlow::setupGrid(size_t n, const doublereal* z)
     }
 }
 
-void StFlow::resetBadValues(double* xg) 
+void StFlow::resetBadValues(double* xg)
 {
     double* x = xg + loc();
     for (size_t j = 0; j < m_points; j++) {
@@ -154,17 +154,6 @@ void StFlow::setTransport(Transport& trans)
     }
 }
 
-void StFlow::enableSoret(bool withSoret)
-{
-    if (m_do_multicomponent) {
-        m_do_soret = withSoret;
-    } else {
-        throw CanteraError("setTransport",
-                           "Thermal diffusion (the Soret effect) "
-                           "requires using a multicomponent transport model.");
-    }
-}
-
 void StFlow::_getInitialSoln(double* x)
 {
     for (size_t j = 0; j < m_points; j++) {
@@ -195,6 +184,12 @@ void StFlow::setGasAtMidpoint(const doublereal* x, size_t j)
 
 void StFlow::_finalize(const doublereal* x)
 {
+    if (!m_do_multicomponent && m_do_soret) {
+        throw CanteraError("_finalize",
+            "Thermal diffusion (the Soret effect) is enabled, and requires "
+            "using a multicomponent transport model.");
+    }
+
     size_t nz = m_zfix.size();
     bool e = m_do_energy[0];
     for (size_t j = 0; j < m_points; j++) {