diff --git a/resolvers/stat.py b/resolvers/stat.py
index 13190670..f894422f 100644
--- a/resolvers/stat.py
+++ b/resolvers/stat.py
@@ -25,7 +25,7 @@ def add_topic_stat_columns(q):
         aliased_authors.author == Author.id,
         Topic.id.in_(select(ShoutTopic.topic).where(ShoutTopic.shout == aliased_shout.id))
     ))
-    q = q.add_columns(func.count(distinct(aliased_authors.author_id)).label('authors_stat'))
+    q = q.add_columns(func.count(distinct(aliased_authors.author)).label('authors_stat'))
 
     # followers
     q = q.outerjoin(aliased_followers, aliased_followers.topic == Topic.id)