diff --git a/server.py b/server.py
index 8a932ee2788855166d741d64a4c9acc1774623d4..2b36d5b418b4150b94fd615b990ec3111d270bee 100644
--- a/server.py
+++ b/server.py
@@ -229,7 +229,7 @@ def course(id=None, handle=None):
 	course['perm'] = query('SELECT * FROM perm WHERE (NOT perm.deleted) AND course_id = ? ORDER BY type', course['id'])
 	perms = query('SELECT perm.* FROM perm JOIN lectures ON (perm.lecture_id = lectures.id) WHERE (NOT perm.deleted) AND lectures.course_id = ? ORDER BY perm.type', course['id'])
 	chapters = {}
-	for i in query('SELECT lectures.id AS id, COUNT(chapters.id) AS c FROM chapters JOIN lectures ON chapters.lecture_id = lectures.id WHERE lectures.course_id = ? AND NOT chapters.deleted GROUP BY chapters.lecture_id;', course['id']):
+	for i in query('SELECT lectures.id AS id, COUNT(chapters.id) AS c FROM chapters JOIN lectures ON chapters.lecture_id = lectures.id WHERE lectures.course_id = ? AND NOT chapters.visible AND NOT chapters.deleted GROUP BY chapters.lecture_id;', course['id']):
 		chapters[i['id']] = i['c']
 	lectures = query('SELECT * FROM lectures WHERE course_id = ? AND (? OR visible) ORDER BY time, duration DESC', course['id'], ismod())
 	for lecture in lectures: