1 files changed, 1 insertions, 1 deletions

diff --git a/src/uniquekey.h b/src/uniquekey.h
index b9a35cb..b3ef7dc 100644
--- a/src/uniquekey.h
+++ b/src/uniquekey.h
@@ -13,7 +13,7 @@ typedef struct s_UniqueKey UniqueKey;
 #if defined(LUA_JITLIBNAME) && (defined(__x86_64__) || defined(_M_X64)) // building against LuaJIT headers, light userdata is restricted to 47 significant bits.
 #define MAKE_UNIQUE_KEY( p_) ((void*)((ptrdiff_t)(p_) & 0x7fffffffffffull))
 #else // LUA_JITLIBNAME
-#define MAKE_UNIQUE_KEY( p_) ((void*) p_)
+#define MAKE_UNIQUE_KEY( p_) ((void*)(ptrdiff_t)(p_))
 #endif // LUA_JITLIBNAME
 
 #define DECLARE_UNIQUE_KEY( name_) UniqueKey name_