diff --git a/src/if_python.c b/src/if_python.c
index b65a57c..56db2b2 100644
--- a/src/if_python.c
+++ b/src/if_python.c
@@ -1219,6 +1219,7 @@
     static char *(argv[2]) = {"/must>not&exist/foo", NULL};
 
     /* Fixups... */
+    PyType_Ready(&IterType);
     PyType_Ready(&BufferType);
     PyType_Ready(&RangeType);
     PyType_Ready(&WindowType);