diff --git a/pointsbot/config.py b/pointsbot/config.py
index 7a63b0d..15a8233 100644
--- a/pointsbot/config.py
+++ b/pointsbot/config.py
@@ -123,6 +123,8 @@ class Config:
                 'flair_template_id': level.flair_template_id,
             })
 
+        obj['tags'] = ','.join(obj['tags'])
+
         with open(self._filepath, 'w') as f:
             toml.dump(obj, f)