diff --git a/sm4/asm_arm64.s b/sm4/asm_arm64.s
index 115cdb4..a6bf805 100644
--- a/sm4/asm_arm64.s
+++ b/sm4/asm_arm64.s
@@ -202,9 +202,9 @@ ksLoop:
   MOVW.P R2, 4(R10)
   MOVW.P R2, -4(R11)
 
-//  ADD $16, R0 
-//  CMP $128, R0
-//  BNE ksLoop
+  ADD $16, R0 
+  CMP $32, R0
+  BNE ksLoop
   RET 
 
 // func encryptBlocksAsm(xk *uint32, dst, src *byte)