diff --git a/internal/sm2ec/fiat/sm2p256scalar_test.go b/internal/sm2ec/fiat/sm2p256scalar_test.go
index 80a427a..87fcca9 100644
--- a/internal/sm2ec/fiat/sm2p256scalar_test.go
+++ b/internal/sm2ec/fiat/sm2p256scalar_test.go
@@ -2,9 +2,7 @@ package fiat_test
 
 import (
 	"bytes"
-	"crypto/rand"
 	"encoding/hex"
-	"fmt"
 	"math/big"
 	"testing"
 
diff --git a/internal/subtle/xor_riscv64.s b/internal/subtle/xor_riscv64.s
index bdf38cb..86752dd 100644
--- a/internal/subtle/xor_riscv64.s
+++ b/internal/subtle/xor_riscv64.s
@@ -46,7 +46,7 @@ less_than4:
 	MOVHU (X6), X10
 	MOVHU (X7), X11
 	XOR X10, X11, X10
-	MOVHU X10, (X5)
+	MOVH X10, (X5)
 	ADD $2, X5
 	ADD $2, X6
 	ADD $2, X7
@@ -57,7 +57,7 @@ less_than2:
 	MOVBU (X6), X10
 	MOVBU (X7), X11
 	XOR X10, X11, X10
-	MOVBU X10, (X5)
+	MOVB X10, (X5)
 
 done:
 	RET