diff --git a/series.py b/series.py
index 974de43..605f916 100644
--- a/series.py
+++ b/series.py
@@ -49,7 +49,7 @@ def CalcAvgRating(sid):
 
 def ListOfSeriesWithMissingBooks():
     with db.engine.connect() as conn:
-        res=conn.exec_driver_sql( "select id, title, num_books, count from ( select s.id, s.title, s.num_books, count(bsl.book_id) from series s, book_series_link bsl where s.id = bsl.series_id group by s.id ) as foo where num_books > count")
+        res=conn.exec_driver_sql( "select id, title, num_books, count from ( select s.id, s.title, s.num_books, count(bsl.book_id) from series s left outer join book_series_link bsl on bsl.series_id=s.id group by s.id) as foo where num_books > count")
     tmp=[]
     for row in res:
         tmp.append({'id': row[0], 'title': row[1]})