diff --git a/sm4/asm_arm64.s b/sm4/asm_arm64.s
index c362d93..f841889 100644
--- a/sm4/asm_arm64.s
+++ b/sm4/asm_arm64.s
@@ -182,7 +182,7 @@ TEXT ·expandKeyAsm(SB),NOSPLIT,$0
   VTBL XTMP7.B16, [M1L.B16], y.B16
   VUSHR $4, x.D2, x.D2
   VAND x.B16, NIBBLE_MASK.B16, XTMP7.B16
-  VTBL XTMP7.B16, [M1H.B16], XTMP7.B16
+  //VTBL XTMP7.B16, [M1H.B16], XTMP7.B16
   VEOR y.B16, XTMP7.B16, x.B16
   //VTBL INVERSE_SHIFT_ROWS.B16, [x.B16], x.B16