--- a/testing/mozharness/scripts/desktop_l10n.py
+++ b/testing/mozharness/scripts/desktop_l10n.py
@@ -1037,17 +1037,17 @@ class DesktopSingleLocale(LocalesMixin, 
     def funsize_props(self):
         """Set buildbot properties required to trigger funsize tasks
          responsible to generate partial updates for successfully generated locales"""
         funsize_info = {
             'locales': self.query_locales(),
             'branch': self.config['branch'],
             'appName': self.config['appName'],
             'platform': self.config['platform'],
-            'fileUrls': self.package_urls
+            'fileUrls': self.package_urls,
         }
         self.info('funsize info: %s' % funsize_info)
         self.set_buildbot_property('funsize_info', json.dumps(funsize_info),
                                    write_to_file=True)
 
     def taskcluster_upload(self):
         auth = os.path.join(os.getcwd(), self.config['taskcluster_credentials_file'])
         credentials = {}