diff --git a/Modules/gcmodule.c b/Modules/gcmodule.c
index dac7feb44c9..02e0cb831eb 100644
--- a/Modules/gcmodule.c
+++ b/Modules/gcmodule.c
@@ -1661,6 +1661,7 @@ void
 _PyGC_Fini(void)
 {
     Py_CLEAR(callbacks);
+    Py_CLEAR(tmod);
 }
 
 /* for debugging */