diff --git a/proxy/vmess/encoding/encoding_test.go b/proxy/vmess/encoding/encoding_test.go
index 83973e4c5..f92ea99f5 100644
--- a/proxy/vmess/encoding/encoding_test.go
+++ b/proxy/vmess/encoding/encoding_test.go
@@ -62,7 +62,7 @@ func TestRequestSerialization(t *testing.T) {
 	assert.Byte(byte(expectedRequest.Security)).Equals(byte(actualRequest.Security))
 
 	_, err = server.DecodeRequestHeader(buffer2)
-	// anti reply attack
+	// anti replay attack
 	assert.Error(err).IsNotNil()
 
 	cancel()
diff --git a/proxy/vmess/encoding/server.go b/proxy/vmess/encoding/server.go
index cdfac9a8d..9d412a179 100644
--- a/proxy/vmess/encoding/server.go
+++ b/proxy/vmess/encoding/server.go
@@ -165,7 +165,7 @@ func (v *ServerSession) DecodeRequestHeader(reader io.Reader) (*protocol.Request
 	copy(sid.key[:], v.requestBodyKey)
 	copy(sid.nonce[:], v.requestBodyIV)
 	if v.sessionHistory.has(sid) {
-		return nil, errors.New("VMess|Server: Duplicated session id. Possibly under reply attack.")
+		return nil, errors.New("VMess|Server: Duplicated session id. Possibly under replay attack.")
 	}
 	v.sessionHistory.add(sid)