--- a/util-src/hashes.c	Fri Jan 06 13:14:17 2017 +0100
+++ b/util-src/hashes.c	Sun Jan 08 14:21:08 2017 +0100
@@ -212,6 +212,9 @@
 };
 
 LUALIB_API int luaopen_util_hashes(lua_State* L) {
+#if (LUA_VERSION_NUM > 501)
+	luaL_checkversion(L);
+#endif
 	lua_newtable(L);
 	luaL_setfuncs(L, Reg, 0);;
 	lua_pushliteral(L, "-3.14");