diff --git a/Python/Python-ast.c b/Python/Python-ast.c
index d2edf74..694987d 100644
--- a/Python/Python-ast.c
+++ b/Python/Python-ast.c
@@ -1109,6 +1109,7 @@
 static int
 ast_traverse(AST_object *self, visitproc visit, void *arg)
 {
+    Py_VISIT(Py_TYPE(self));
     Py_VISIT(self->dict);
     return 0;
 }