diff --git a/swig/python/codegen/codegen.py b/swig/python/codegen/codegen.py
index 136b556e2..09864c024 100644
--- a/swig/python/codegen/codegen.py
+++ b/swig/python/codegen/codegen.py
@@ -289,9 +289,9 @@ def dispatchType(self, tree):
             if not isinstance(tree.value, ast.Name) :
                 self.RaiseError(tree, "Not a supported type")
             if not (tree.value.id == "numpy" or tree.value.id == "np"):
-                self.RaiseError(tree, "%s is not a supported type"%(tree.value.id))
+                self.RaiseError(tree, "%s.%s is not a supported type"%(tree.value.id, tree.attr))
             if tree.attr not in self.numpytypes:
-                self.RaiseError(tree, "%s is not a supported numpy type"%(tree.attr))
+                self.RaiseError(tree, "%s.%s is not a supported numpy type"%(tree.value.id, tree.attr))
             self.write(self.numpytypes[tree.attr])
         else:
             self.RaiseError(tree, "Not a supported type")