diff --git a/lib/gitlab/email/receiver.rb b/lib/gitlab/email/receiver.rb
index 01a206666a49f4431e7a7bd1f3371aa1c8df4e90..daa1177a23a92288c1a663317a9ff8bbcd8c57b0 100644
--- a/lib/gitlab/email/receiver.rb
+++ b/lib/gitlab/email/receiver.rb
@@ -60,7 +60,7 @@ module Gitlab
 
       def key_from_additional_headers
         Array(mail.references).find do |mail_id|
-          key = Gitlab::IncomingEmail.key_from_fallback_reply_mail_id(mail_id)
+          key = Gitlab::IncomingEmail.key_from_fallback_message_id(mail_id)
           break key if key
         end
       end
diff --git a/lib/gitlab/incoming_email.rb b/lib/gitlab/incoming_email.rb
index f4ef15597163a4732f4fe91a7166ea3a8aab3cf4..d7be50bd43725d8cee76cf04299b0cc3d7b80308 100644
--- a/lib/gitlab/incoming_email.rb
+++ b/lib/gitlab/incoming_email.rb
@@ -1,7 +1,7 @@
 module Gitlab
   module IncomingEmail
     class << self
-      FALLBACK_REPLY_MAIL_ID_REGEX = /\Areply\-(.+)@#{Gitlab.config.gitlab.host}\Z/.freeze
+      FALLBACK_MESSAGE_ID_REGEX = /\Areply\-(.+)@#{Gitlab.config.gitlab.host}\Z/.freeze
 
       def enabled?
         config.enabled && config.address
@@ -21,8 +21,8 @@ module Gitlab
         match[1]
       end
 
-      def key_from_fallback_reply_mail_id(mail_id)
-        match = mail_id.match(FALLBACK_REPLY_MAIL_ID_REGEX)
+      def key_from_fallback_message_id(mail_id)
+        match = mail_id.match(FALLBACK_MESSAGE_ID_REGEX)
         return unless match
 
         match[1]
diff --git a/spec/lib/gitlab/incoming_email_spec.rb b/spec/lib/gitlab/incoming_email_spec.rb
index bb1fe089206b993e415f6a18e8382e56df5b46b4..1dcf2c0668b75f3e748a868c83022be5b65fc7af 100644
--- a/spec/lib/gitlab/incoming_email_spec.rb
+++ b/spec/lib/gitlab/incoming_email_spec.rb
@@ -43,9 +43,9 @@ describe Gitlab::IncomingEmail, lib: true do
     end
   end
 
-  context 'self.key_from_fallback_reply_mail_id' do
+  context 'self.key_from_fallback_message_id' do
     it 'returns reply key' do
-      expect(described_class.key_from_fallback_reply_mail_id('reply-key@localhost')).to eq('key')
+      expect(described_class.key_from_fallback_message_id('reply-key@localhost')).to eq('key')
     end
   end
 end