diff --git a/openlibrary/core/bookshelves.py b/openlibrary/core/bookshelves.py
index d0eec5b945f..856d5d96542 100644
--- a/openlibrary/core/bookshelves.py
+++ b/openlibrary/core/bookshelves.py
@@ -85,7 +85,7 @@ def most_logged_books(cls, shelf_id=None, limit=10, since=False):
         oldb = db.get_db()
         where = 'WHERE bookshelf_id' + ('=$shelf_id' if shelf_id else ' IS NOT NULL ')
         if since:
-            where += 'AND created >= $since'
+            where += ' AND created >= $since'
         query = f'select work_id, count(*) as cnt from bookshelves_books {where}'
         query += ' group by work_id order by cnt desc limit $limit'
         logger.info("Query: %s", query)