diff --git a/ui/jquery.ui.widget.js b/ui/jquery.ui.widget.js
index 7eea40e70..d4d925e7c 100644
--- a/ui/jquery.ui.widget.js
+++ b/ui/jquery.ui.widget.js
@@ -239,27 +239,27 @@ $.Widget.prototype = {
 	},
 
 	_trigger: function( type, event, data ) {
-		var callback = this.options[ type ];
+		var prop, orig,
+			callback = this.options[ type ];
 
+		data = data || {};
 		event = $.Event( event );
 		event.type = ( type === this.widgetEventPrefix ?
 			type :
 			this.widgetEventPrefix + type ).toLowerCase();
-		data = data || {};
-
-		// copy original event properties over to the new event
-		// this would happen if we could call $.event.fix instead of $.Event
-		// but we don't have a way to force an event to be fixed multiple times
-		if ( event.originalEvent ) {
-			for ( var i = $.event.props.length, prop; i; ) {
-				prop = $.event.props[ --i ];
-				event[ prop ] = event.originalEvent[ prop ];
-			}
-		}
-
 		// the original event may come from any element
 		// so we need to reset the target on the new event
-		event.target = this.element[0];
+		event.target = this.element[ 0 ];
+
+		// copy original event properties over to the new event
+		orig = event.originalEvent;
+		if ( orig ) {
+			for ( prop in orig ) {
+				if ( !( prop in event ) ) {
+					event[ prop ] = orig[ prop ];
+				}
+			}
+		}
 
 		this.element.trigger( event, data );