diff --git a/src/effects/private/qml/WindowHeapDelegate.qml b/src/effects/private/qml/WindowHeapDelegate.qml
index 0cd8671405..96b7fd930e 100644
--- a/src/effects/private/qml/WindowHeapDelegate.qml
+++ b/src/effects/private/qml/WindowHeapDelegate.qml
@@ -228,6 +228,13 @@ Item {
                     ? (thumb.activeHidden ? 0 : effect.partialActivationFactor)
                     : (thumb.activeHidden ? 1 - effect.partialActivationFactor : 1)
             }
+            PropertyChanges {
+                target: thumbSource
+                x: 0
+                y: 0
+                width: thumb.width
+                height: thumb.height
+            }
             PropertyChanges {
                 target: icon
                 opacity: effect.partialActivationFactor