diff --git a/src/event.js b/src/event.js
index 02ed088c..c0238cca 100644
--- a/src/event.js
+++ b/src/event.js
@@ -102,7 +102,7 @@ jQuery.event = {
 
 		if ( events ) {
 			// Unbind all events for the element
-			if ( !types )
+			if ( types == undefined )
 				for ( var type in events )
 					this.remove( elem, type );
 			else {