diff --git a/fem/elementtransformation.cpp b/fem/elementtransformation.cpp

index 937fe46d..cd1752c6 100644

--- a/fem/elementtransformation.cpp

+++ b/fem/elementtransformation.cpp

@@ -233,6 +233,8 @@ namespace ngfem

       case ET_PYRAMID: return trafo_pyramid;

       case ET_HEX: return trafo_hex;

       }

+

+      throw Exception ("Function GetFEElementTransformation got invalid argument");

   }