diff --git a/app/mailers/app_mailer.rb b/app/mailers/app_mailer.rb
index 3bb30f0e5..2da65a0e6 100644
--- a/app/mailers/app_mailer.rb
+++ b/app/mailers/app_mailer.rb
@@ -1,9 +1,9 @@
 class AppMailer < Devise::Mailer
-  helper :application, :mailer
+  helper :application, :mailer, :input_sanitize
   include Devise::Controllers::UrlHelpers
   default template_path: 'users/mailer'
-  default from: ENV["MAIL_FROM"]
-  default reply: ENV["MAIL_REPLYTO"]
+  default from: ENV['MAIL_FROM']
+  default reply: ENV['MAIL_REPLYTO']
 
   def notification(user, notification, opts = {})
     @user = user