--- a/util-src/ringbuffer.c	Fri Jan 06 13:14:17 2017 +0100
+++ b/util-src/ringbuffer.c	Sun Jan 08 14:21:08 2017 +0100
@@ -197,6 +197,9 @@
 }
 
 int luaopen_util_ringbuffer(lua_State* L) {
+#if (LUA_VERSION_NUM > 501)
+	luaL_checkversion(L);
+#endif
 	if(luaL_newmetatable(L, "ringbuffer_mt")) {
 		lua_pushcfunction(L, rb_tostring);
 		lua_setfield(L, -2, "__tostring");