Fix ref counts in initialization code.
diff --git a/Doc/ext/noddy3.c b/Doc/ext/noddy3.c
index 7b044d1..08ac31e 100644
--- a/Doc/ext/noddy3.c
+++ b/Doc/ext/noddy3.c
@@ -237,5 +237,6 @@
     if (m == NULL)
       return;
 
+    Py_INCREF(&NoddyType);
     PyModule_AddObject(m, "Noddy", (PyObject *)&NoddyType);
 }