diff --git a/lib/rollbar/plugins/active_job.rb b/lib/rollbar/plugins/active_job.rb
index f0442ec7..b1baa84e 100644
--- a/lib/rollbar/plugins/active_job.rb
+++ b/lib/rollbar/plugins/active_job.rb
@@ -27,5 +27,9 @@ def self.included(base)
       ActionMailer::DeliveryJob.send(:include,
                                      Rollbar::ActiveJob)
     end
+    # Rails >= 6.0
+    if defined?(ActionMailer::MailDeliveryJob)
+      ActionMailer::MailDeliveryJob.send(:include, Rollbar::ActiveJob)
+    end
   end
 end