diff --git a/modules/ve-mw/ui/widgets/ve.ui.MWTransclusionOutlineContainerWidget.js b/modules/ve-mw/ui/widgets/ve.ui.MWTransclusionOutlineContainerWidget.js
index 6cef1f1071..9e7d32384e 100644
--- a/modules/ve-mw/ui/widgets/ve.ui.MWTransclusionOutlineContainerWidget.js
+++ b/modules/ve-mw/ui/widgets/ve.ui.MWTransclusionOutlineContainerWidget.js
@@ -153,10 +153,17 @@ ve.ui.MWTransclusionOutlineContainerWidget.prototype.addPartWidget = function (
  *  parameter ids like "part_1/param1".
  */
 ve.ui.MWTransclusionOutlineContainerWidget.prototype.selectPartById = function ( partId ) {
+	var changed = false;
 	for ( var id in this.partWidgets ) {
-		this.partWidgets[ id ].setSelected( id === partId );
+		var selected = id === partId;
+		if ( this.partWidgets[ id ].isSelected() !== selected ) {
+			this.partWidgets[ id ].setSelected( selected );
+			changed = true;
+		}
+	}
+	if ( changed ) {
+		this.emit( 'updateOutlineControlButtons', partId );
 	}
-	this.emit( 'updateOutlineControlButtons', partId );
 };
 
 /**