diff --git a/phpunit.xml b/phpunit.xml
index 8d47f564f..494e39d60 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -23,6 +23,7 @@
         <env name="BCRYPT_ROUNDS" value="4" />
         <env name="DB_DATABASE" value="testing" />
         <env name="CACHE_DRIVER" value="array" />
+        <env name="MAIL_MAILER" value="array" />
         <env name="SESSION_DRIVER" value="array" />
         <env name="QUEUE_CONNECTION" value="sync" />
         <env name="MAIL_DRIVER" value="array" />