diff --git a/reservation_units/admin/reservation_unit/form.py b/reservation_units/admin/reservation_unit/form.py
index 8d7ceb2de..9839ecae6 100644
--- a/reservation_units/admin/reservation_unit/form.py
+++ b/reservation_units/admin/reservation_unit/form.py
@@ -11,10 +11,10 @@
 
 
 def remove_empty_timeslots(timeslots: list[dict[str, str]]) -> None:
-    # Iterate in reverse order so that items can be deleted without affecting the loop
-    for i, timeslot in enumerate(reversed(timeslots)):
-        if timeslot == {"begin": "", "end": ""}:
-            del timeslots[i]
+    empty_timeslot = {"begin": "", "end": ""}
+
+    while empty_timeslot in timeslots:
+        timeslots.remove(empty_timeslot)
 
 
 class TimeslotForm(forms.Form):