diff --git a/transport/http_util.go b/transport/http_util.go
index baec02da..a3c68d4c 100644
--- a/transport/http_util.go
+++ b/transport/http_util.go
@@ -352,7 +352,7 @@ func decodeGrpcMessageUnchecked(msg string) string {
 	for i := 0; i < lenMsg; i++ {
 		c := msg[i]
 		if c == percentByte && i+2 < lenMsg {
-			parsed, err := strconv.ParseInt(msg[i+1:i+3], 16, 8)
+			parsed, err := strconv.ParseUint(msg[i+1:i+3], 16, 8)
 			if err != nil {
 				buf.WriteByte(c)
 			} else {
diff --git a/transport/http_util_test.go b/transport/http_util_test.go
index 41bf5477..a5f8a85f 100644
--- a/transport/http_util_test.go
+++ b/transport/http_util_test.go
@@ -135,6 +135,7 @@ func TestDecodeGrpcMessage(t *testing.T) {
 		{"H%61o", "Hao"},
 		{"H%6", "H%6"},
 		{"%G0", "%G0"},
+		{"%E7%B3%BB%E7%BB%9F", "系统"},
 	} {
 		actual := decodeGrpcMessage(tt.input)
 		if tt.expected != actual {