diff --git a/app/Providers/MailServiceProvider.php b/app/Providers/MailServiceProvider.php
index e72097c4ce33..84573620a115 100644
--- a/app/Providers/MailServiceProvider.php
+++ b/app/Providers/MailServiceProvider.php
@@ -51,7 +51,7 @@ class MailServiceProvider extends MailProvider
 
         });
     
-        $this->app->afterResolving('mail.manager', function (MailManager $mailManager) {
+        $this->app->afterResolving('mail.manager', function (GmailTransportManager $mailManager) {
             $mailManager->getSwiftMailer()->registerPlugin($this->app->make(CssInlinerPlugin::class));
             return $mailManager;
         });