diff --git a/src/lj_mcode.c b/src/lj_mcode.c
index bb7cf96b..f0a1f699 100644
--- a/src/lj_mcode.c
+++ b/src/lj_mcode.c
@@ -204,8 +204,8 @@ static void mcode_protect(jit_State *J, int prot)
 
 /* -- MCode area allocation ----------------------------------------------- */
 
-#if LJ_TARGET_X64
-#define mcode_validptr(p)	((p) && (uintptr_t)(p) < (uintptr_t)1<<47)
+#if LJ_64
+#define mcode_validptr(p)	(p)
 #else
 #define mcode_validptr(p)	((p) && (uintptr_t)(p) < 0xffff0000)
 #endif