diff --git a/files/routes/comments.py b/files/routes/comments.py
index cf58cba9d1..f6c38c3d3b 100644
--- a/files/routes/comments.py
+++ b/files/routes/comments.py
@@ -449,7 +449,7 @@ def api_comment(v):
 		notify_users = set()
 		
 		for x in g.db.query(Subscription.user_id).filter_by(submission_id=c.parent_submission).all():
-			notify_users.add(x)
+			notify_users.add(x[0])
 		
 		if parent.author.id != v.id: notify_users.add(parent.author.id)