diff --git a/ui/jquery.ui.selectmenu.js b/ui/jquery.ui.selectmenu.js
index 730c46d19..e8b6e0ee6 100644
--- a/ui/jquery.ui.selectmenu.js
+++ b/ui/jquery.ui.selectmenu.js
@@ -192,7 +192,7 @@ $.widget( "ui.selectmenu", {
 
 		this.isOpen = true;
 		this._toggleAttr();
-		this.menuWrap.position( $.extend( {}, this.options.position, { of: this.button } ) );
+		this.menuWrap.position( $.extend( { of: this.button }, this.options.position ) );
 
 		this._trigger( "open", event );
 	},