diff --git a/tests/phpunit/includes/api/ApiAccountCreationTest.php b/tests/phpunit/includes/api/ApiAccountCreationTest.php
index 60f65371c29..4fbbc27aaaf 100644
--- a/tests/phpunit/includes/api/ApiAccountCreationTest.php
+++ b/tests/phpunit/includes/api/ApiAccountCreationTest.php
@@ -7,8 +7,14 @@
  */
 class ApiCreateAccountTest extends ApiTestCase {
 	function setUp() {
+		global $wgHooks;
 		parent::setUp();
 		LoginForm::setCreateaccountToken();
+
+		$hooks = $wgHooks;
+		Hooks::clear( 'AlternateUserMailer' );
+		$hooks['AlternateUserMailer'] = array( function () { return false; } );
+		$this->setMwGlobals( array( 'wgHooks' => $hooks ) );
 	}
 
 	/**