diff --git a/src/effects/private/qml/WindowHeapDelegate.qml b/src/effects/private/qml/WindowHeapDelegate.qml
index 7ad8264448..b0a47f6d66 100644
--- a/src/effects/private/qml/WindowHeapDelegate.qml
+++ b/src/effects/private/qml/WindowHeapDelegate.qml
@@ -70,7 +70,8 @@ Item {
     }
 
     visible: opacity > 0
-    z: thumb.activeDragHandler.active ? 100 : client.stackingOrder + (thumb.client.desktop == KWinComponents.Workspace.currentDesktop ? 100 : 0)
+    z: thumb.activeDragHandler.active ? 1000
+        : client.stackingOrder + (thumb.client.desktop == KWinComponents.Workspace.currentDesktop ? 100 : 0)
 
     component TweenBehavior : Behavior {
         enabled: thumb.state !== "partial" && thumb.windowHeap.animationEnabled && !thumb.activeDragHandler.active