diff --git a/service/tcp.go b/service/tcp.go
index 926274aa..bb6c4383 100644
--- a/service/tcp.go
+++ b/service/tcp.go
@@ -120,8 +120,8 @@ func NewShadowsocksStreamAuthenticator(ciphers CipherList, replayCache *ReplayCa
 	if metrics == nil {
 		metrics = &NoOpShadowsocksConnMetrics{}
 	}
-	if logger == nil {
-		logger = &noopLogger{}
+	if l == nil {
+		l = &noopLogger{}
 	}
 	return func(clientConn transport.StreamConn) (string, transport.StreamConn, *onet.ConnectionError) {
 		// Find the cipher and acess key id.