diff --git a/applets/taskmanager/package/contents/ui/ContextMenu.qml b/applets/taskmanager/package/contents/ui/ContextMenu.qml
--- a/applets/taskmanager/package/contents/ui/ContextMenu.qml
+++ b/applets/taskmanager/package/contents/ui/ContextMenu.qml
@@ -574,6 +574,7 @@
                 checked: menu.visualParent && menu.get(atm.IsGroupable) === true
 
                 text: i18n("Allow this program to be grouped")
+                icon: "view-group"
 
                 onClicked: tasksModel.requestToggleGrouping(menu.modelIndex)
             }