diff --git a/biscuit/apps/untis/sub.py b/biscuit/apps/untis/sub.py
index c16bafcce016cbe9514ed75113998029fc5c4b9f..fecb3ccf5480827452890884b9aa3b5fa1f9b845 100644
--- a/biscuit/apps/untis/sub.py
+++ b/biscuit/apps/untis/sub.py
@@ -168,6 +168,8 @@ def generate_event_table(events):
 
         if event.from_lesson != event.to_lesson:
             sub_row.lesson = "{}.-{}.".format(event.from_lesson, event.to_lesson)
+        else:
+            sub_row.lesson = "{}.".format(event.from_lesson)
 
         sub_row.classes = format_classes(event.classes)
         sub_row.teachers = event.teachers