diff --git a/phpunit.xml b/phpunit.xml
index a3f699ebd..28ecef304 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -17,7 +17,6 @@
     <env name="MAIL_MAILER" value="array"/>
     <env name="SESSION_DRIVER" value="array"/>
     <env name="QUEUE_CONNECTION" value="sync"/>
-    <env name="MAIL_DRIVER" value="array"/>
   </php>
   <source>
     <include>