diff --git a/src/agenda_culturel/filters.py b/src/agenda_culturel/filters.py
index 1ed030d..1418814 100644
--- a/src/agenda_culturel/filters.py
+++ b/src/agenda_culturel/filters.py
@@ -63,7 +63,6 @@ class EventFilter(django_filters.FilterSet):
         label="À proximité de",
         method="no_filter",
         empty_label=_("Select a location"),
-        field_name='attr__slug',
         to_field_name='slug',
         queryset=ReferenceLocation.objects.filter(main__gt=0).order_by("-main", "name__unaccent")
     )
@@ -112,6 +111,13 @@ class EventFilter(django_filters.FilterSet):
         fields = ["tags", "exclude_tags", "status", "recurrences"]
 
     def __init__(self, *args, **kwargs):
+        # urls were using pk, now we moved to slug
+        if len(args) > 0 and "position" in args[0] and args[0]["position"].isdigit():
+            args[0]._mutable = True
+            el = ReferenceLocation.objects.filter(pk=int(args[0]["position"])).values("slug").first()
+            args[0]["position"] = None if el is None else el["slug"]
+            args[0]._mutable = False
+
         super().__init__(*args, **kwargs)
         if not kwargs["request"].user.is_authenticated:
             self.form.fields.pop("status")
@@ -314,7 +320,7 @@ class EventFilter(django_filters.FilterSet):
 
     def get_url_add_suggested_position(self, location):
         result = self.request.get_full_path()
-        return result + ('&' if '?' in result else '?') + 'position=' + str(location.pk) + "&radius=" + str(location.suggested_distance)
+        return result + ('&' if '?' in result else '?') + 'position=' + str(location.slug) + "&radius=" + str(location.suggested_distance)
 
 
 class EventFilterAdmin(django_filters.FilterSet):
diff --git a/src/agenda_culturel/migrations/0151_referencelocation_slug.py b/src/agenda_culturel/migrations/0151_referencelocation_slug.py
index 8741443..f31fd62 100644
--- a/src/agenda_culturel/migrations/0151_referencelocation_slug.py
+++ b/src/agenda_culturel/migrations/0151_referencelocation_slug.py
@@ -25,4 +25,8 @@ class Migration(migrations.Migration):
             name='slug',
             field=autoslug.fields.AutoSlugField(default=None, editable=False, null=True, populate_from='name', unique=True),
         ),
+        migrations.RunPython(
+            code=migrate_data_slug_forward,
+            reverse_code=migrate_data_slug_backward,
+        ),
     ]