diff --git a/src/decoration/qgnomeplatformdecoration.cpp b/src/decoration/qgnomeplatformdecoration.cpp
index 87b6463..f6c53df 100644
--- a/src/decoration/qgnomeplatformdecoration.cpp
+++ b/src/decoration/qgnomeplatformdecoration.cpp
@@ -449,7 +449,10 @@ void QGnomePlatformDecoration::paint(QPaintDevice *device)
     // ********************************
     p.save();
     p.setPen(borderColor);
-    p.drawLine(margins().left(), margins().top() - WINDOW_BORDER_WIDTH, surfaceRect.width() - margins().right(), margins().top() - WINDOW_BORDER_WIDTH);
+    p.drawLine(QLineF(margins().left(),
+                      margins().top() - WINDOW_BORDER_WIDTH / 2.0,
+                      surfaceRect.width() - margins().right(),
+                      margins().top() - WINDOW_BORDER_WIDTH / 2.0));
     p.restore();
 
     // Window title