diff --git a/lbitlib.c b/lbitlib.c
index 24ceac6..fbbcc58 100644
--- a/lbitlib.c
+++ b/lbitlib.c
@@ -15,7 +15,7 @@
 /********************************************************************/
 #if defined(LUA_VERSION_NUM) && LUA_VERSION_NUM == 501
 #include "compat-5.2.c"
-#elif defined(LUA_VERSION_NUM) && LUA_VERSION_NUM == 503
+#elif defined(LUA_VERSION_NUM) && LUA_VERSION_NUM >= 503
 #define luaL_checkunsigned(L, n) ((lua_Unsigned)luaL_checkinteger((L), (n)))
 #define lua_pushunsigned(L, n) (lua_pushinteger(L, (lua_Integer)(n)))
 #endif