diff --git a/modules/dt-ve/dt.ui.UsernameCompletionAction.js b/modules/dt-ve/dt.ui.UsernameCompletionAction.js
index 460d2f403..f397666d2 100644
--- a/modules/dt-ve/dt.ui.UsernameCompletionAction.js
+++ b/modules/dt-ve/dt.ui.UsernameCompletionAction.js
@@ -60,6 +60,7 @@ function MWUsernameCompletionAction() {
 		this.localUsers.sort( sortAuthors );
 	}
 	this.remoteUsers = [];
+	this.sequenceAdded = false;
 }
 
 /* Inheritance */
@@ -102,9 +103,19 @@ MWUsernameCompletionAction.prototype.insertAndOpen = function () {
 	}
 	fragment.collapseToEnd().select();
 
+	this.sequenceAdded = true;
+
 	return this.open();
 };
 
+MWUsernameCompletionAction.prototype.getSequenceLength = function () {
+	if ( this.sequenceAdded ) {
+		return this.constructor.static.sequenceLength;
+	}
+	// Parent method
+	return MWUsernameCompletionAction.super.prototype.getSequenceLength.apply( this, arguments );
+};
+
 MWUsernameCompletionAction.prototype.getSuggestions = function ( input ) {
 	var title = mw.Title.makeTitle( mw.config.get( 'wgNamespaceIds' ).user, input ),
 		validatedInput = title ? input : '',