diff --git a/src/hlua_fcn.c b/src/hlua_fcn.c
index 7950038ce..f987bb054 100644
--- a/src/hlua_fcn.c
+++ b/src/hlua_fcn.c
@@ -9,43 +9,40 @@
 
 #include <common/time.h>
 
-/* Return true if the data in stack[<ud>] is an object of
- * type <class_ref>.
- */
-static int hlua_metaistype(lua_State *L, int ud, int class_ref)
-{
-	if (!lua_getmetatable(L, ud))
-		return 0;
-
-	lua_rawgeti(L, LUA_REGISTRYINDEX, class_ref);
-	if (!lua_rawequal(L, -1, -2)) {
-		lua_pop(L, 2);
-		return 0;
-	}
-
-	lua_pop(L, 2);
-	return 1;
-}
-
 /* Return an object of the expected type, or throws an error. */
 void *hlua_checkudata(lua_State *L, int ud, int class_ref)
 {
 	void *p;
+	int ret;
 
 	/* Check if the stack entry is an array. */
 	if (!lua_istable(L, ud))
-		WILL_LJMP(luaL_argerror(L, ud, NULL));
+		luaL_argerror(L, ud, NULL);
+
+	/* pop the metatable of the referencecd object. */
+	if (!lua_getmetatable(L, ud))
+		luaL_argerror(L, ud, NULL);
+
+	/* pop the expected metatable. */
+	lua_rawgeti(L, LUA_REGISTRYINDEX, class_ref);
+
 	/* Check if the metadata have the expected type. */
-	if (!hlua_metaistype(L, ud, class_ref))
-		WILL_LJMP(luaL_argerror(L, ud, NULL));
+	ret = lua_rawequal(L, -1, -2);
+	lua_pop(L, 2);
+	if (!ret)
+		luaL_argerror(L, ud, NULL);
+
 	/* Push on the stack at the entry [0] of the table. */
 	lua_rawgeti(L, ud, 0);
+
 	/* Check if this entry is userdata. */
 	p = lua_touserdata(L, -1);
 	if (!p)
-		WILL_LJMP(luaL_argerror(L, ud, NULL));
+		luaL_argerror(L, ud, NULL);
+
 	/* Remove the entry returned by lua_rawgeti(). */
 	lua_pop(L, 1);
+
 	/* Return the associated struct. */
 	return p;
 }