Fix ref counts in initialization code.
diff --git a/Doc/ext/noddy2.c b/Doc/ext/noddy2.c
index b1e620e..fcce2ab 100644
--- a/Doc/ext/noddy2.c
+++ b/Doc/ext/noddy2.c
@@ -184,5 +184,6 @@
     if (m == NULL)
       return;
 
+    Py_INCREF(&NoddyType);
     PyModule_AddObject(m, "Noddy", (PyObject *)&NoddyType);
 }