diff --git a/src/lcmulti.c b/src/lcmulti.c
index d46e72d..ffb5f8d 100644
--- a/src/lcmulti.c
+++ b/src/lcmulti.c
@@ -50,7 +50,9 @@ static int lcurl_multi_cleanup(lua_State *L){
     luaL_unref(L, LCURL_LUA_REGISTRY, p->h_ref);
     p->h_ref = LUA_NOREF;
   }
-
+  luaL_unref(L, LCURL_LUA_REGISTRY, p->tm.cb_ref);
+  luaL_unref(L, LCURL_LUA_REGISTRY, p->tm.ud_ref);
+  p->tm.cb_ref = p->tm.ud_ref = LUA_NOREF;
   return 0;
 }