diff --git a/core/backends/lan/socketlinereader.h b/core/backends/lan/socketlinereader.h
index df11c3ee3..b3be55a70 100644
--- a/core/backends/lan/socketlinereader.h
+++ b/core/backends/lan/socketlinereader.h
@@ -41,8 +41,8 @@ public:
 
     QByteArray readLine() { return mPackages.dequeue(); }
     qint64 write(const QByteArray& data) { return mSocket->write(data); }
-    QHostAddress peerAddress() { return mSocket->peerAddress(); }
-    qint64 bytesAvailable() { return mPackages.size(); }
+    QHostAddress peerAddress() const { return mSocket->peerAddress(); }
+    qint64 bytesAvailable() const { return mPackages.size(); }
 
 Q_SIGNALS:
     void readyRead();