diff --git a/src/gui/tray/MainWindow.qml b/src/gui/tray/MainWindow.qml
index e7dfe7ae7226a..9bd6cc27a9e67 100644
--- a/src/gui/tray/MainWindow.qml
+++ b/src/gui/tray/MainWindow.qml
@@ -118,6 +118,7 @@ ApplicationWindow {
         maskSource: Rectangle {
             width: trayWindow.width
             height: trayWindow.height
+            color: colorWithoutTransparency(palette.window)
             radius: Systray.useNormalWindow ? 0.0 : Style.trayWindowRadius
         }
     }