diff --git a/GPClient/gpclient.cpp b/GPClient/gpclient.cpp
index a2741cb..8e56643 100644
--- a/GPClient/gpclient.cpp
+++ b/GPClient/gpclient.cpp
@@ -32,8 +32,8 @@ GPClient::GPClient(QWidget *parent, IVpn *vpn)
     QObject *ov = dynamic_cast<QObject*>(vpn);
     connect(ov, SIGNAL(connected()), this, SLOT(onVPNConnected()));
     connect(ov, SIGNAL(disconnected()), this, SLOT(onVPNDisconnected()));
-    connect(ov, SIGNAL(error(const &QString)), this, SLOT(onVPNError(const QString&)));
-    connect(ov, SIGNAL(logAvailable(const &QString)), this, SLOT(onVPNLogAvailable(const QString&)));
+    connect(ov, SIGNAL(error(QString)), this, SLOT(onVPNError(QString)));
+    connect(ov, SIGNAL(logAvailable(QString)), this, SLOT(onVPNLogAvailable(QString)));
 
     // Initiallize the context menu of system tray.
     initSystemTrayIcon();
diff --git a/GPClient/vpn_dbus.h b/GPClient/vpn_dbus.h
index a66c86a..28b24eb 100644
--- a/GPClient/vpn_dbus.h
+++ b/GPClient/vpn_dbus.h
@@ -27,7 +27,7 @@ public:
 signals: // SIGNALS
   void connected();
   void disconnected();
-  void error(const QString &errorMessage);
-  void logAvailable(const QString &log);
+  void error(QString errorMessage);
+  void logAvailable(QString log);
 };
 #endif