diff --git a/endpoints/trackhelper.py b/endpoints/trackhelper.py
index d1003d3d4..b3e2d86eb 100644
--- a/endpoints/trackhelper.py
+++ b/endpoints/trackhelper.py
@@ -27,7 +27,7 @@ def track_and_log(event_name, repo, **kwargs):
     metadata['oauth_token_id'] = authenticated_oauth_token.id
     metadata['oauth_token_application_id'] = authenticated_oauth_token.application.client_id
     metadata['oauth_token_application'] = authenticated_oauth_token.application.name
-    analytics_id = 'oauth:' + authenticated_oauth_token.id
+    analytics_id = 'oauth:{0}'.format(authenticated_oauth_token.id)
   elif authenticated_user:
     metadata['username'] = authenticated_user.username
     analytics_id = authenticated_user.username
@@ -38,7 +38,7 @@ def track_and_log(event_name, repo, **kwargs):
     if authenticated_token.kind:
       metadata['token_type'] = authenticated_token.kind.name
 
-    analytics_id = 'token:' + authenticated_token.code
+    analytics_id = 'token:{0}'.format(authenticated_token.code)
   else:
     metadata['public'] = True
     analytics_id = 'anonymous'