diff --git a/applets/systemtray/package/contents/ui/ExpandedRepresentation.qml b/applets/systemtray/package/contents/ui/ExpandedRepresentation.qml
--- a/applets/systemtray/package/contents/ui/ExpandedRepresentation.qml
+++ b/applets/systemtray/package/contents/ui/ExpandedRepresentation.qml
@@ -98,8 +98,8 @@
 
         PlasmaComponents.ToolButton {
             id: pinButton
-            implicitHeight: Math.round(units.gridUnit * 1.25)
-            implicitWidth: implicitHeight
+            icon.width: units.iconSizes.small
+            icon.height: units.iconSizes.small
             checkable: true
             checked: plasmoid.configuration.pin
             onToggled: plasmoid.configuration.pin = checked