diff --git a/src/compat.h b/src/compat.h
index e2ab307..49e83f9 100644
--- a/src/compat.h
+++ b/src/compat.h
@@ -5,6 +5,8 @@
 #include "lauxlib.h"
 
 #if LUA_VERSION_NUM==501
+#define luaL_setfuncs socket_setfuncs
+#define luaL_testudata socket_testudata
 void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup);
 void *luaL_testudata ( lua_State *L, int arg, const char *tname);
 #endif