diff --git a/ui/jquery.ui.selectmenu.js b/ui/jquery.ui.selectmenu.js
index bc9ab61f5b..3533579e29 100644
--- a/ui/jquery.ui.selectmenu.js
+++ b/ui/jquery.ui.selectmenu.js
@@ -74,7 +74,7 @@ $.widget( "ui.selectmenu", {
 		// Create button
 		this.button = $( "<span>", {
 			"class": "ui-selectmenu-button ui-widget ui-state-default ui-corner-all",
-			tabindex: ( tabindex ? tabindex : this.options.disabled ? -1 : 0 ),
+			tabindex: tabindex || this.options.disabled ? -1 : 0,
 			id: this.ids.button,
 			width: this.element.outerWidth(),
 			role: "combobox",