diff --git a/src/openforms/formio/tests/validation/test_file.py b/src/openforms/formio/tests/validation/test_file.py
index c656687d5f..61470f6696 100644
--- a/src/openforms/formio/tests/validation/test_file.py
+++ b/src/openforms/formio/tests/validation/test_file.py
@@ -602,10 +602,10 @@ def test_attach_upload_validates_unknown_file_type(self):
         }
 
         is_valid, errors = validate_formio_data(component, data, submission=submission)
-        error = extract_error(errors["foo"][0], "type")
+        error = extract_error(errors["foo"][0], "non_field_errors")
 
         self.assertFalse(is_valid)
-        self.assertEqual(error.code, "blank")
+        self.assertEqual(error.code, "invalid")
         self.assertEqual(
             error,
             _(
diff --git a/src/openforms/tests/e2e/test_input_validation.py b/src/openforms/tests/e2e/test_input_validation.py
index 8dbc9f4830..ba0320fe22 100644
--- a/src/openforms/tests/e2e/test_input_validation.py
+++ b/src/openforms/tests/e2e/test_input_validation.py
@@ -940,7 +940,7 @@ def test_unknown_file_type(self):
         # The frontend validation will *not* create a TemporaryFileUpload,
         # as the frontend will block the upload because of the invalid file type.
         # However the user could do an handcrafted API call.
-        # For this reason, we manually create an invalid TemporaryFileUpload
+        # For this reason, we manually try to create an invalid TemporaryFileUpload
         # and use it for the `api_value`:
 
         with open(TEST_FILES / "unknown-type", "rb") as infile:
@@ -966,8 +966,8 @@ def test_unknown_file_type(self):
                 ],
             )
 
-        # Make sure the frontend did not create one:
-        self.assertEqual(TemporaryFileUpload.objects.count(), 1)
+        # Make sure that no temporary files were created
+        self.assertEqual(TemporaryFileUpload.objects.count(), 0)
 
 
 class SingleAddressNLTests(ValidationsTestCase):