diff --git a/applets/systemtray/container/package/contents/ui/main.qml b/applets/systemtray/container/package/contents/ui/main.qml
--- a/applets/systemtray/container/package/contents/ui/main.qml
+++ b/applets/systemtray/container/package/contents/ui/main.qml
@@ -27,6 +27,7 @@
 
     Layout.minimumWidth: internalSystray ? internalSystray.Layout.minimumWidth : 0
     Layout.minimumHeight: internalSystray ? internalSystray.Layout.minimumHeight : 0
+    Layout.preferredHeight: Layout.minimumHeight
 
     Plasmoid.preferredRepresentation: Plasmoid.fullRepresentation
     property Item internalSystray
diff --git a/applets/systemtray/package/contents/ui/main.qml b/applets/systemtray/package/contents/ui/main.qml
--- a/applets/systemtray/package/contents/ui/main.qml
+++ b/applets/systemtray/package/contents/ui/main.qml
@@ -30,6 +30,8 @@
 
     Layout.minimumHeight: vertical ? tasksRow.implicitHeight + (expander.visible ? expander.implicitHeight : 0) + units.smallSpacing : units.smallSpacing
 
+    Layout.preferredHeight: Layout.minimumHeight
+
     property var iconSizes: ["small", "smallMedium", "medium", "large", "huge", "enormous"];
 
     property bool vertical: plasmoid.formFactor == PlasmaCore.Types.Vertical