diff --git a/src/travis/svars-write.py b/src/travis/svars-write.py
index 98f0222e..779a4c96 100644
--- a/src/travis/svars-write.py
+++ b/src/travis/svars-write.py
@@ -7,6 +7,6 @@ cfg['client_secret'] = os.getenv('client_secret')
 jid = os.getenv('jid')
 cfg['refresh_token'] = os.getenv('refresh_%s' % jid)
 gampath = os.getenv('gampath')
-out_file = os.join(gampath, 'oauth2.txt')
+out_file = os.path.join(gampath, 'oauth2.txt')
 with open(out_file, 'w') as f:
   json.dump(cfg, f)