diff --git a/src/effects/private/qml/WindowHeap.qml b/src/effects/private/qml/WindowHeap.qml
index 66b45e7998..303649b15a 100644
--- a/src/effects/private/qml/WindowHeap.qml
+++ b/src/effects/private/qml/WindowHeap.qml
@@ -235,6 +235,7 @@ FocusScope {
 
                 PlasmaCore.IconItem {
                     id: icon
+                    usesPlasmaTheme: false
                     width: PlasmaCore.Units.iconSizes.large
                     height: width
                     source: thumb.client.icon