diff --git a/src/fake-xml-http-request.js b/src/fake-xml-http-request.js
index 3c4aed5..f7993e1 100644
--- a/src/fake-xml-http-request.js
+++ b/src/fake-xml-http-request.js
@@ -178,7 +178,7 @@ EventedObject.prototype = {
       }
     }
 
-    return !!event.defaultPrevented;
+    return !event.defaultPrevented;
   },
 
   /*