diff --git a/differential/customfield/__tests__/DifferentialBugzillaIdCustomFieldTestCase.php b/differential/customfield/__tests__/DifferentialBugzillaIdCustomFieldTestCase.php
index d2670d4..7912846 100644
--- a/differential/customfield/__tests__/DifferentialBugzillaIdCustomFieldTestCase.php
+++ b/differential/customfield/__tests__/DifferentialBugzillaIdCustomFieldTestCase.php
@@ -1,49 +1,52 @@
 <?php
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 final class DifferentialBugzillaBugIDCustomFieldTestCase
   extends PhabricatorTestCase {
 
   public function testBugIdCommitMessageFieldBasicValidation() {
+    $env = PhabricatorEnv::beginScopedEnv();
+    $env->overrideEnvConfig('bugzilla.require_bugs', true);
+
     $invalids = array(null, '', ' ', '12.3', '1e3');
 
     $field = new DifferentialBugzillaBugIDCommitMessageField();
     $field->setViewer(PhabricatorUser::getOmnipotentUser());
 
     foreach ($invalids as $value) {
       $caught = false;
       try {
         $result = $field->validateFieldValue($value);
       } catch (DifferentialFieldValidationException $ex) {
         $caught = $ex;
       }
 
       $this->assertTrue(
           ($caught instanceof DifferentialFieldValidationException));
     }
   }
 
   public function testBugIdPropertyViewRendering() {
     $field = new DifferentialBugzillaBugIDField();
     $field->setValue('123');
     $this->assertEqual(
       $field->renderPropertyViewValue(array())->getHTMLContent(),
       '<a href="'.PhabricatorEnv::getEnvConfig('bugzilla.url').'/123" rel="noreferrer">123</a>'
     );
   }
 
   public function testLinkBetweenCommitMessageAndCustomField() {
     $cm_field = new DifferentialBugzillaBugIDCommitMessageField();
     $custom_field = new DifferentialBugzillaBugIDField();
     $this->assertEqual(
       $cm_field->getCustomFieldKey(),
       $custom_field->getFieldKey()
     );
     $this->assertEqual(
       $custom_field->getFieldKeyForConduit(),
       DifferentialBugzillaBugIDCommitMessageField::FIELDKEY
     );
   }
 }