diff --git a/applets/taskmanager/package/contents/ui/Task.qml b/applets/taskmanager/package/contents/ui/Task.qml
--- a/applets/taskmanager/package/contents/ui/Task.qml
+++ b/applets/taskmanager/package/contents/ui/Task.qml
@@ -197,9 +197,14 @@
 
         imagePath: "widgets/tasks"
         property string basePrefix: "normal"
-        prefix: TaskTools.taskPrefix("normal")
-        onRepaintNeeded: prefix = TaskTools.taskPrefix(basePrefix);
-        onBasePrefixChanged: prefix = TaskTools.taskPrefix(basePrefix);
+        prefix: TaskTools.taskPrefix(basePrefix)
+        onRepaintNeeded: updatePrefix()
+
+        function updatePrefix() {
+            prefix = Qt.binding(function() {
+                return TaskTools.taskPrefix(basePrefix);
+            });
+        }
 
         PlasmaCore.ToolTipArea {
             id: toolTip