diff --git a/Objects/genobject.c b/Objects/genobject.c
index 367b4de0272..ccce315ee91 100644
--- a/Objects/genobject.c
+++ b/Objects/genobject.c
@@ -10,7 +10,7 @@
 static int
 gen_traverse(PyGenObject *gen, visitproc visit, void *arg)
 {
-	Py_VISIT(gen->gi_frame);
+	Py_VISIT((PyObject *)gen->gi_frame);
 	return 0;
 }