1 files changed, 7 insertions, 3 deletions

diff --git a/lauxlib.h b/lauxlib.h
index df3de4f8..65714911 100644
--- a/lauxlib.h
+++ b/lauxlib.h
@@ -160,11 +160,15 @@ LUALIB_API void (luaL_requiref) (lua_State *L, const char *modname,
 /*
 ** Internal assertions for in-house debugging
 */
+#if !defined(lua_assert)
+
 #if defined LUAI_ASSERT
-#include <assert.h>
-#define lua_assert(c)   assert(c)
+  #include <assert.h>
+  #define lua_assert(c)         assert(c)
 #else
-#define lua_assert(x)   ((void)0)
+  #define lua_assert(c)         ((void)0)
+#endif
+
 #endif