--- a/testing/specialpowers/content/specialpowersAPI.js
+++ b/testing/specialpowers/content/specialpowersAPI.js
@@ -1712,17 +1712,17 @@ SpecialPowersAPI.prototype = {
     syncXHR.send();
   },
 
   // :jdm gets credit for this.  ex: getPrivilegedProps(window, 'location.href');
   getPrivilegedProps(obj, props) {
     var parts = props.split(".");
     for (var i = 0; i < parts.length; i++) {
       var p = parts[i];
-      if (obj[p]) {
+      if (obj[p] != undefined) {
         obj = obj[p];
       } else {
         return null;
       }
     }
     return obj;
   },