diff --git a/mocha_server.py b/mocha_server.py
index 5fad336..7affaa5 100755
--- a/mocha_server.py
+++ b/mocha_server.py
@@ -97,6 +97,7 @@ def fetch_top_n(num):
     cursor.execute('SELECT * FROM users ORDER BY score DESC')
     output = cursor.fetchall()
 
+    num = int(num)
     output = json.dumps([dict(row) for row in output][:num])
     conn.commit()
     conn.close()