diff --git a/src/qt/trafficgraphwidget.cpp b/src/qt/trafficgraphwidget.cpp
--- a/src/qt/trafficgraphwidget.cpp
+++ b/src/qt/trafficgraphwidget.cpp
@@ -100,6 +100,7 @@
         }
     }
 
+    painter.setRenderHint(QPainter::Antialiasing);
     if (!vSamplesIn.empty()) {
         QPainterPath p;
         paintPath(p, vSamplesIn);