diff --git a/netbox/extras/tests/test_customfields.py b/netbox/extras/tests/test_customfields.py
index 3fd0dc83e..e7ee778a1 100644
--- a/netbox/extras/tests/test_customfields.py
+++ b/netbox/extras/tests/test_customfields.py
@@ -12,6 +12,7 @@ from dcim.models import Manufacturer, Rack, Site
 from extras.choices import *
 from extras.models import CustomField
 from ipam.models import VLAN
+from utilities.choices import CSVDelimiterChoices, ImportFormatChoices
 from utilities.testing import APITestCase, TestCase
 from virtualization.models import VirtualMachine
 
@@ -1057,7 +1058,7 @@ class CustomFieldImportTest(TestCase):
         )
         csv_data = '\n'.join(','.join(row) for row in data)
 
-        response = self.client.post(reverse('dcim:site_import'), {'data': csv_data, 'format': 'csv'})
+        response = self.client.post(reverse('dcim:site_import'), {'data': csv_data, 'format': ImportFormatChoices.CSV, 'csv_delimiter': CSVDelimiterChoices.AUTO,})
         self.assertEqual(response.status_code, 302)
         self.assertEqual(Site.objects.count(), 3)
 
diff --git a/netbox/utilities/forms/bulk_import.py b/netbox/utilities/forms/bulk_import.py
index 2f49e7c12..9b0e4f18a 100644
--- a/netbox/utilities/forms/bulk_import.py
+++ b/netbox/utilities/forms/bulk_import.py
@@ -93,7 +93,7 @@ class BulkImportForm(BootstrapMixin, SyncedDataMixin, forms.Form):
             'format': _('Unable to detect data format. Please specify.')
         })
 
-    def _clean_csv(self, data, delimiter=None):
+    def _clean_csv(self, data, delimiter=CSVDelimiterChoices.AUTO):
         """
         Clean CSV-formatted data. The first row will be treated as column headers.
         """
diff --git a/netbox/utilities/testing/views.py b/netbox/utilities/testing/views.py
index dc17548a2..38560f886 100644
--- a/netbox/utilities/testing/views.py
+++ b/netbox/utilities/testing/views.py
@@ -10,7 +10,7 @@ from extras.choices import ObjectChangeActionChoices
 from extras.models import ObjectChange
 from netbox.models.features import ChangeLoggingMixin
 from users.models import ObjectPermission
-from utilities.choices import ImportFormatChoices
+from utilities.choices import CSVDelimiterChoices, ImportFormatChoices
 from .base import ModelTestCase
 from .utils import disable_warnings, post_data
 
@@ -559,7 +559,8 @@ class ViewTestCases:
         def test_bulk_import_objects_without_permission(self):
             data = {
                 'data': self._get_csv_data(),
-                'format': 'csv',
+                'format': ImportFormatChoices.CSV,
+                'csv_delimiter': CSVDelimiterChoices.AUTO,
             }
 
             # Test GET without permission
@@ -576,7 +577,8 @@ class ViewTestCases:
             initial_count = self._get_queryset().count()
             data = {
                 'data': self._get_csv_data(),
-                'format': 'csv',
+                'format': ImportFormatChoices.CSV,
+                'csv_delimiter': CSVDelimiterChoices.AUTO,
             }
 
             # Assign model-level permission
@@ -605,6 +607,7 @@ class ViewTestCases:
             data = {
                 'format': ImportFormatChoices.CSV,
                 'data': csv_data,
+                'csv_delimiter': CSVDelimiterChoices.AUTO,
             }
 
             # Assign model-level permission
@@ -637,7 +640,8 @@ class ViewTestCases:
             initial_count = self._get_queryset().count()
             data = {
                 'data': self._get_csv_data(),
-                'format': 'csv',
+                'format': ImportFormatChoices.CSV,
+                'csv_delimiter': CSVDelimiterChoices.AUTO,
             }
 
             # Assign constrained permission