diff --git a/sm4/asm_arm64.s b/sm4/asm_arm64.s
index 4c30d29..48cd953 100644
--- a/sm4/asm_arm64.s
+++ b/sm4/asm_arm64.s
@@ -90,7 +90,7 @@ GLOBL fk_mask<>(SB), RODATA, $16
   VEOR y.B16, x.B16, x.B16
 
 #define SM4_TAO_L2(x, y)         \
-  SM4_SBOX(x, y);                              \
+  LDP	nibble_mask<>(SB), (R0, R1);                              \
   ;                                           \ //####################  4 parallel L2 linear transforms ##################//
   VSHL $13, x.S4, XTMP6.S4;                   \
   VUSHR $19, x.S4, y.S4;                      \