diff --git a/Objects/funcobject.c b/Objects/funcobject.c
index 0282242..8871e0a 100644
--- a/Objects/funcobject.c
+++ b/Objects/funcobject.c
@@ -252,6 +252,7 @@
 	Py_XDECREF(op->func_defaults);
 	Py_XDECREF(op->func_doc);
 	Py_XDECREF(op->func_dict);
+	Py_XDECREF(op->func_closure);
 	op = (PyFunctionObject *) PyObject_AS_GC(op);
 	PyObject_DEL(op);
 }
@@ -303,6 +304,11 @@
 		if (err)
 			return err;
 	}
+	if (f->func_closure) {
+		err = visit(f->func_closure, arg);
+		if (err)
+			return err;
+	}
 	return 0;
 }