diff --git a/app/mailers/emails/merge_requests.rb b/app/mailers/emails/merge_requests.rb
index a97d55f1b50..1130969a26d 100644
--- a/app/mailers/emails/merge_requests.rb
+++ b/app/mailers/emails/merge_requests.rb
@@ -6,7 +6,7 @@ module Emails
       @target_url = project_merge_request_url(@project, @merge_request)
       mail(from: sender(@merge_request.author_id),
            to: recipient(recipient_id),
-           subject: subject("#{@merge_request.title} (!#{@merge_request.iid})"))
+           subject: subject("#{@merge_request.title} (##{@merge_request.iid})"))
     end
 
     def reassigned_merge_request_email(recipient_id, merge_request_id, previous_assignee_id, updated_by_user_id)
@@ -16,7 +16,7 @@ module Emails
       @target_url = project_merge_request_url(@project, @merge_request)
       mail(from: sender(updated_by_user_id),
            to: recipient(recipient_id),
-           subject: subject("#{@merge_request.title} (!#{@merge_request.iid})"))
+           subject: subject("#{@merge_request.title} (##{@merge_request.iid})"))
     end
 
     def closed_merge_request_email(recipient_id, merge_request_id, updated_by_user_id)
@@ -26,7 +26,7 @@ module Emails
       @target_url = project_merge_request_url(@project, @merge_request)
       mail(from: sender(updated_by_user_id),
            to: recipient(recipient_id),
-           subject: subject("#{@merge_request.title} (!#{@merge_request.iid})"))
+           subject: subject("#{@merge_request.title} (##{@merge_request.iid})"))
     end
 
     def merged_merge_request_email(recipient_id, merge_request_id, updated_by_user_id)
@@ -35,7 +35,7 @@ module Emails
       @target_url = project_merge_request_url(@project, @merge_request)
       mail(from: sender(updated_by_user_id),
            to: recipient(recipient_id),
-           subject: subject("#{@merge_request.title} (!#{@merge_request.iid})"))
+           subject: subject("#{@merge_request.title} (##{@merge_request.iid})"))
     end
   end
 
diff --git a/app/mailers/emails/notes.rb b/app/mailers/emails/notes.rb
index ccbdadf010f..2a877bc1593 100644
--- a/app/mailers/emails/notes.rb
+++ b/app/mailers/emails/notes.rb
@@ -27,7 +27,7 @@ module Emails
       @target_url = project_merge_request_url(@project, @merge_request, anchor: "note_#{@note.id}")
       mail(from: sender(@note.author_id),
            to: recipient(recipient_id),
-           subject: subject("#{@merge_request.title} (!#{@merge_request.iid})"))
+           subject: subject("#{@merge_request.title} (##{@merge_request.iid})"))
     end
 
     def note_wall_email(recipient_id, note_id)
diff --git a/app/views/notify/closed_merge_request_email.html.haml b/app/views/notify/closed_merge_request_email.html.haml
index 809d46f31be..574e8bfef24 100644
--- a/app/views/notify/closed_merge_request_email.html.haml
+++ b/app/views/notify/closed_merge_request_email.html.haml
@@ -1,2 +1,2 @@
 %p
-  = "Merge Request !#{@merge_request.iid} was closed by #{@updated_by.name}"
+  = "Merge Request ##{@merge_request.iid} was closed by #{@updated_by.name}"
diff --git a/app/views/notify/closed_merge_request_email.text.haml b/app/views/notify/closed_merge_request_email.text.haml
index ee434ec8cb2..d6b76e906c5 100644
--- a/app/views/notify/closed_merge_request_email.text.haml
+++ b/app/views/notify/closed_merge_request_email.text.haml
@@ -1,4 +1,4 @@
-= "Merge Request #{@merge_request.iid} was closed by #{@updated_by.name}"
+= "Merge Request ##{@merge_request.iid} was closed by #{@updated_by.name}"
 
 Merge Request url: #{project_merge_request_url(@merge_request.target_project, @merge_request)}
 
diff --git a/app/views/notify/merged_merge_request_email.html.haml b/app/views/notify/merged_merge_request_email.html.haml
index 0c62d439aed..6762fae7f64 100644
--- a/app/views/notify/merged_merge_request_email.html.haml
+++ b/app/views/notify/merged_merge_request_email.html.haml
@@ -1,2 +1,2 @@
 %p
-  = "Merge Request !#{@merge_request.iid} was merged"
+  = "Merge Request ##{@merge_request.iid} was merged"
diff --git a/app/views/notify/merged_merge_request_email.text.haml b/app/views/notify/merged_merge_request_email.text.haml
index 550f677fed4..360da60bc3f 100644
--- a/app/views/notify/merged_merge_request_email.text.haml
+++ b/app/views/notify/merged_merge_request_email.text.haml
@@ -1,4 +1,4 @@
-= "Merge Request #{@merge_request.iid} was merged"
+= "Merge Request ##{@merge_request.iid} was merged"
 
 Merge Request Url: #{project_merge_request_url(@merge_request.target_project, @merge_request)}