diff --git a/mozilla/embedding/components/ui/progressDlg/nsProgressDialog.js b/mozilla/embedding/components/ui/progressDlg/nsProgressDialog.js
index 975438058d3..40d632e169c 100644
--- a/mozilla/embedding/components/ui/progressDlg/nsProgressDialog.js
+++ b/mozilla/embedding/components/ui/progressDlg/nsProgressDialog.js
@@ -840,7 +840,8 @@ nsProgressDialog.prototype = {
                              .getService( Components.interfaces.nsIStringBundleService )
                                .createBundle( "chrome://global/locale/nsProgressDialog.properties");
         }
-        return this.mBundle.formatStringFromName( propertyId, strings, len );
+        return len ? this.mBundle.formatStringFromName( propertyId, strings, len )
+                   : this.mBundle.getStringFromName( propertyId );
     },
 
     // Get localizable string (from dialog <data> elements).