diff -r 3fbfa61634de Modules/_tkinter.c
--- a/Modules/_tkinter.c	Thu Jul 19 00:14:35 2012 -0500
+++ b/Modules/_tkinter.c	Thu Jul 19 16:29:29 2012 +0200
@@ -3133,8 +3133,10 @@
 
     PyDict_SetItemString(d, "TkappType", (PyObject *)&Tkapp_Type);
 
-    if (PyType_Ready(&Tktt_Type) < 0)
+    if (PyType_Ready(&Tktt_Type) < 0) {
+        Py_DECREF(m);
         return NULL;
+    }
     PyDict_SetItemString(d, "TkttType", (PyObject *)&Tktt_Type);
 
     Py_TYPE(&PyTclObject_Type) = &PyType_Type;