diff --git a/containments/desktop/package/contents/ui/main.qml b/containments/desktop/package/contents/ui/main.qml
--- a/containments/desktop/package/contents/ui/main.qml
+++ b/containments/desktop/package/contents/ui/main.qml
@@ -56,16 +56,16 @@
             return units.iconSizeHints.panel;
         }
 
-        return undefined;
+        return 0;
     }
 
     Plasmoid.switchHeight: {
         // Support expanding into the full representation only on vertical panels.
         if (isPopup && plasmoid.formFactor == PlasmaCore.Types.Vertical) {
             return units.iconSizeHints.panel;
         }
 
-        return undefined;
+        return 0;
     }
 
     LayoutMirroring.enabled: Qt.application.layoutDirection === Qt.RightToLeft