diff --git a/sm4/asm_arm64.s b/sm4/asm_arm64.s
index 975b1f8..a172e3a 100644
--- a/sm4/asm_arm64.s
+++ b/sm4/asm_arm64.s
@@ -95,7 +95,6 @@ GLOBL fk_mask<>(SB), RODATA, $16
   VEOR y.B16, x.B16, x.B16
 
 #define SM4_TAO_L2(x, y)         \
-  SM4_SBOX(x, y);                             \
   ;                                           \ //####################  4 parallel L2 linear transforms ##################//
   VSHL $13, x.S4, XTMP6.S4;                   \
   VUSHR $19, x.S4, y.S4;                      \