diff --git a/src/effects/private/qml/WindowHeapDelegate.qml b/src/effects/private/qml/WindowHeapDelegate.qml
index 1690e7173a..b41be7f689 100644
--- a/src/effects/private/qml/WindowHeapDelegate.qml
+++ b/src/effects/private/qml/WindowHeapDelegate.qml
@@ -157,6 +157,7 @@ Item {
         width: PlasmaCore.Units.iconSizes.large
         height: width
         source: thumb.client.icon
+        usesPlasmaTheme: false
         anchors.horizontalCenter: thumbSource.horizontalCenter
         anchors.bottom: thumbSource.bottom
         anchors.bottomMargin: -height / 4