diff -up gdl-0.9.4/src/pythongdl.cpp.python gdl-0.9.4/src/pythongdl.cpp
--- gdl-0.9.4/src/pythongdl.cpp.python 2013-07-26 03:30:32.000000000 -0600
+++ gdl-0.9.4/src/pythongdl.cpp 2013-09-30 10:24:27.092666180 -0600
@@ -373,7 +373,7 @@ PyObject *GDLSub( PyObject *self, PyObje
if( libCall)
e = new EnvT( NULL, sub);
else
- e = new EnvUDT( NULL, sub);
+ e = new EnvUDT( NULL, static_cast<DSubUD*>(sub));
Guard< EnvBaseT> e_guard( e);