diff --git a/program/filters.py b/program/filters.py
index e05e58d70c58d55ae4171ceb22055487f03bfe8d..4afad05123e8bfaabd7a2ada8996d6a881e8c76c 100644
--- a/program/filters.py
+++ b/program/filters.py
@@ -3,7 +3,6 @@ import datetime
 from django_filters import rest_framework as filters
 from django_filters import widgets
 
-from django import forms
 from django.contrib.auth.models import User
 from django.db.models import Q, QuerySet
 from django.utils import timezone
@@ -182,16 +181,10 @@ class TimeSlotFilterSet(filters.FilterSet):
             queryset = self.filter_surrounding(queryset, "surrounding", timezone.now())
         return queryset
 
-    class Meta:
-        model = models.TimeSlot
-        fields = [
-            "order",
-            "start",
-            "end",
-            "surrounding",
-        ]
+    def get_form_class(self):
+        form_cls = super().get_form_class()
 
-        class form(forms.Form):
+        class TimeSlotFilterSetFormWithDefaults(form_cls):
             def clean_start(self):
                 start = self.cleaned_data.get("start", None)
                 return start or timezone.now().date()
@@ -200,6 +193,23 @@ class TimeSlotFilterSet(filters.FilterSet):
                 end = self.cleaned_data.get("end", None)
                 return end or self.cleaned_data["start"] + datetime.timedelta(days=60)
 
+        # We only want defaults to apply in the context of the list action.
+        # When accessing individual timeslots we don’t want the queryset to be restricted
+        # to the default range of 60 days as get_object would yield a 404 otherwise.
+        if self.request.parser_context["view"].action == "list":
+            return TimeSlotFilterSetFormWithDefaults
+        else:
+            return form_cls
+
+    class Meta:
+        model = models.TimeSlot
+        fields = [
+            "order",
+            "start",
+            "end",
+            "surrounding",
+        ]
+
 
 class NoteFilterSet(StaticFilterHelpTextMixin, filters.FilterSet):
     ids = ModelMultipleChoiceFilter(