diff --git a/CHANGELOG b/CHANGELOG
index 0321bf0e312..3ca30375f6d 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -26,6 +26,7 @@ v 8.1.0
   - Add a system note and update relevant merge requests when a branch is deleted or re-added (Stan Hu)
   - Make diff file view easier to use on mobile screens (Stan Hu)
   - Improved performance of finding users by username or Email address
+  - Fix 500 when editing CI service
   - Fix bug where merge request comments created by API would not trigger notifications (Stan Hu)
   - Add support for creating directories from Files page (Stan Hu)
   - Allow removing of project without confirmation when JavaScript is disabled (Stan Hu)
diff --git a/app/controllers/projects/ci_services_controller.rb b/app/controllers/projects/ci_services_controller.rb
index 406f313ae79..550a019e8e2 100644
--- a/app/controllers/projects/ci_services_controller.rb
+++ b/app/controllers/projects/ci_services_controller.rb
@@ -14,17 +14,17 @@ class Projects::CiServicesController < Projects::ApplicationController
   end
 
   def update
-    if @service.update_attributes(service_params)
-      redirect_to edit_namespace_project_ci_service_path(@project, @project.namespace, @service.to_param)
+    if service.update_attributes(service_params)
+      redirect_to edit_namespace_project_ci_service_path(@project.namespace, @project, service.to_param)
     else
       render 'edit'
     end
   end
 
   def test
-    last_build = @project.builds.last
+    last_build = @project.ci_builds.last
 
-    if @service.execute(last_build)
+    if service.execute(last_build)
       message = { notice: 'We successfully tested the service' }
     else
       message = { alert: 'We tried to test the service but error occurred' }