diff --git a/src/thermo/SpeciesThermoFactory.cpp b/src/thermo/SpeciesThermoFactory.cpp
index 207512a3c..cfa6dda7f 100644
--- a/src/thermo/SpeciesThermoFactory.cpp
+++ b/src/thermo/SpeciesThermoFactory.cpp
@@ -397,7 +397,8 @@ SpeciesThermoInterpType* newSpeciesThermoInterpType(const XML_Node& thermo)
     for (size_t i = 1; i < tp.size(); i++) {
         if (!ba::iequals(tp[i]->name(), thermoType)) {
             throw CanteraError("newSpeciesThermoInterpType",
-                "Encountered unsupported mixed species thermo parameterizations");
+                "Encountered unsupported mixed species thermo "
+                "parameterizations, '{}' and '{}'", tp[i]->name(), thermoType);
         }
     }
     if ((tp.size() > 2 && thermoType != "nasa9") ||