diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index 60c4fbc..2a7df8a 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -303,13 +303,16 @@
 	return r;
 
   bail:
+	Py_DECREF(type->tp_bases);
+	Py_DECREF(type->tp_base);
+	if (type->tp_mro != old_mro) {
+		Py_DECREF(type->tp_mro);
+	}
+
 	type->tp_bases = old_bases;
 	type->tp_base = old_base;
 	type->tp_mro = old_mro;
 
-	Py_DECREF(value);
-	Py_DECREF(new_base);
-
 	return -1;
 }