diff --git a/src/qt/trafficgraphwidget.cpp b/src/qt/trafficgraphwidget.cpp
--- a/src/qt/trafficgraphwidget.cpp
+++ b/src/qt/trafficgraphwidget.cpp
@@ -22,7 +22,7 @@
     : QWidget(parent), timer(0), fMax(0.0f), nMins(0), vSamplesIn(),
       vSamplesOut(), nLastBytesIn(0), nLastBytesOut(0), clientModel(0) {
     timer = new QTimer(this);
-    connect(timer, SIGNAL(timeout()), SLOT(updateRates()));
+    connect(timer, &QTimer::timeout, this, &TrafficGraphWidget::updateRates);
 }
 
 void TrafficGraphWidget::setClientModel(ClientModel *model) {