diff --git a/seminar/views/views_all.py b/seminar/views/views_all.py
index 22b6a743..b14ef764 100644
--- a/seminar/views/views_all.py
+++ b/seminar/views/views_all.py
@@ -969,7 +969,7 @@ class ClankyResitelView(generic.ListView):
 		queryset = []
 		skupiny_clanku = group_by_rocnik(clanky)
 		for skupina in skupiny_clanku:
-			skupina.sort(key=lambda clanek: clanek.kod_v_rocniku)
+			skupina.sort(key=lambda clanek: clanek.kod_v_rocniku())
 			for clanek in skupina:
 				queryset.append(clanek)
 		return queryset