diff --git a/wagtail/wagtailimages/tests/test_admin_views.py b/wagtail/wagtailimages/tests/test_admin_views.py
index a659f6b4a7..cef1230666 100644
--- a/wagtail/wagtailimages/tests/test_admin_views.py
+++ b/wagtail/wagtailimages/tests/test_admin_views.py
@@ -75,6 +75,9 @@ class TestImageAddView(TestCase, WagtailTestUtils):
         # is displayed on the form
         self.assertNotContains(response, '<label for="id_collection">')
 
+        # Ensure the form supports file uploads
+        self.assertContains(response, 'enctype="multipart/form-data"')
+
     def test_get_with_collections(self):
         root_collection = Collection.get_first_root_node()
         root_collection.add_child(name="Evil plans")
@@ -264,6 +267,9 @@ class TestImageEditView(TestCase, WagtailTestUtils):
         self.assertEqual(response.status_code, 200)
         self.assertTemplateUsed(response, 'wagtailimages/images/edit.html')
 
+        # Ensure the form supports file uploads
+        self.assertContains(response, 'enctype="multipart/form-data"')
+
     @override_settings(WAGTAIL_USAGE_COUNT_ENABLED=True)
     def test_with_usage_count(self):
         response = self.get()