diff --git a/internal/sm2ec/p256_asm_arm64.s b/internal/sm2ec/p256_asm_arm64.s
index 6639f6f..7ca6bc4 100644
--- a/internal/sm2ec/p256_asm_arm64.s
+++ b/internal/sm2ec/p256_asm_arm64.s
@@ -1282,8 +1282,8 @@ TEXT ·p256PointAddAffineAsm(SB),0,$264-48
 
 	// If zero is 0, sets res = in2
 	VLD1 (b_ptr), [V6.B16, V7.B16]
-	MOVD $8, hlp1
-	VLD1 (RSP)(hlp1), [V8.B16, V9.B16]
+	MOVD RSP, hlp1
+	VLD1.W 8(hlp1), [V8.B16, V9.B16]
 	MOVD $p256one<>(SB), hlp1
 	VLD1 (hlp1), [V10.B16, V11.B16]
 	VBIT V14.B16, V6.B16, V0.B16