diff --git a/CHANGELOG b/CHANGELOG
index 7ea2631f9f4..8c0a972c4e0 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -141,6 +141,7 @@ v 8.11.0 (unreleased)
   - Each `File::exists?` replaced to `File::exist?` because of deprecate since ruby version 2.2.0
   - Add auto-completition in pipeline (Katarzyna Kobierska Ula Budziszewska)
   - Add pipelines tab to merge requests
+  - Fix notification_service argument error of declined invitation emails
   - Fix a memory leak caused by Banzai::Filter::SanitizationFilter
   - Speed up todos queries by limiting the projects set we join with
   - Ensure file editing in UI does not overwrite commited changes without warning user
diff --git a/app/services/notification_service.rb b/app/services/notification_service.rb
index 66a838b3d13..6139ed56e25 100644
--- a/app/services/notification_service.rb
+++ b/app/services/notification_service.rb
@@ -242,7 +242,6 @@ class NotificationService
       project_member.real_source_type,
       project_member.project.id,
       project_member.invite_email,
-      project_member.access_level,
       project_member.created_by_id
     ).deliver_later
   end
@@ -269,7 +268,6 @@ class NotificationService
       group_member.real_source_type,
       group_member.group.id,
       group_member.invite_email,
-      group_member.access_level,
       group_member.created_by_id
     ).deliver_later
   end
diff --git a/spec/services/notification_service_spec.rb b/spec/services/notification_service_spec.rb
index 18da3b1b453..f81a58899fd 100644
--- a/spec/services/notification_service_spec.rb
+++ b/spec/services/notification_service_spec.rb
@@ -1113,6 +1113,46 @@ describe NotificationService, services: true do
     end
   end
 
+  describe 'GroupMember' do
+    describe '#decline_group_invite' do
+      let(:creator) { create(:user) }
+      let(:group) { create(:group) }
+      let(:member) { create(:user) }
+
+      before(:each) do
+        group.add_owner(creator)
+        group.add_developer(member, creator)
+      end
+
+      it do
+        group_member = group.members.first
+
+        expect do
+          notification.decline_group_invite(group_member)
+        end.to change { ActionMailer::Base.deliveries.size }.by(1)
+      end
+    end
+  end
+
+  describe 'ProjectMember' do
+    describe '#decline_group_invite' do
+      let(:project) { create(:project) }
+      let(:member) { create(:user) }
+
+      before(:each) do
+        project.team << [member, :developer, project.owner]
+      end
+
+      it do
+        project_member = project.members.first
+
+        expect do
+          notification.decline_project_invite(project_member)
+        end.to change { ActionMailer::Base.deliveries.size }.by(1)
+      end
+    end
+  end
+
   def build_team(project)
     @u_watcher               = create_global_setting_for(create(:user), :watch)
     @u_participating         = create_global_setting_for(create(:user), :participating)