diff --git a/seminar/models/tvorba.py b/seminar/models/tvorba.py
index 719375ff..47384de4 100644
--- a/seminar/models/tvorba.py
+++ b/seminar/models/tvorba.py
@@ -6,6 +6,7 @@ import tempfile
 import logging
 
 from django.contrib.sites.shortcuts import get_current_site
+from django.core.files.storage import FileSystemStorage
 from django.db import models
 from django.utils import timezone
 from django.conf import settings
diff --git a/seminar/utils.py b/seminar/utils.py
index cacc52d8..176831cb 100644
--- a/seminar/utils.py
+++ b/seminar/utils.py
@@ -309,6 +309,15 @@ def podproblemy_v_cislu(cislo, problemy=None, hlavni_problemy=None):
 		else:
 			podproblemy[-1].append(problem)
 
+	for podproblem in podproblemy.keys():
+		def int_or_zero(p):
+			try:
+				return int(p.kod)
+			except ValueError:
+				return 0
+
+		podproblemy[podproblem] = sorted(podproblemy[podproblem], key=int_or_zero)
+
 	return podproblemy
 
 class TypDeadline(Enum):