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");
   }