diff --git a/src/lj_asm.c b/src/lj_asm.c
index bed2268e..d961927b 100644
--- a/src/lj_asm.c
+++ b/src/lj_asm.c
@@ -1017,7 +1017,11 @@ static uint32_t ir_khash(IRIns *ir)
   } else {
     lua_assert(irt_isgcv(ir->t));
     lo = u32ptr(ir_kgc(ir));
+#if LJ_GC64
+    hi = (uint32_t)(u64ptr(ir_kgc(ir)) >> 32) | (irt_toitype(ir->t) << 15);
+#else
     hi = lo + HASH_BIAS;
+#endif
   }
   return hashrot(lo, hi);
 }