diff --git a/applets/taskmanager/package/contents/ui/ToolTipInstance.qml b/applets/taskmanager/package/contents/ui/ToolTipInstance.qml
--- a/applets/taskmanager/package/contents/ui/ToolTipInstance.qml
+++ b/applets/taskmanager/package/contents/ui/ToolTipInstance.qml
@@ -82,6 +82,8 @@
 
         // launcher icon
         PlasmaCore.IconItem {
+            Layout.preferredWidth: units.iconSizes.medium
+            Layout.preferredHeight: units.iconSizes.medium
             source: icon
             animated: false
             usesPlasmaTheme: false