diff --git a/app/services/milestones/reopen_service.rb b/app/services/milestones/reopen_service.rb
index ff1ba23bdb2..573f9ee5c21 100644
--- a/app/services/milestones/reopen_service.rb
+++ b/app/services/milestones/reopen_service.rb
@@ -1,7 +1,7 @@
 module Milestones
   class ReopenService < Milestones::BaseService
     def execute(milestone)
-      if milestone.reopen
+      if milestone.activate
         event_service.reopen_milestone(milestone, current_user)
       end
 
diff --git a/app/services/milestones/update_service.rb b/app/services/milestones/update_service.rb
index 69254a79670..307e96a2b36 100644
--- a/app/services/milestones/update_service.rb
+++ b/app/services/milestones/update_service.rb
@@ -1,10 +1,10 @@
 module Milestones
   class UpdateService < Milestones::BaseService
     def execute(milestone)
-      state = params.delete('state_event')
+      state = params.delete('state_event') || params.delete(:state_event)
 
       case state
-      when 'reopen'
+      when 'activate'
         Milestones::ReopenService.new(project, current_user, {}).execute(milestone)
       when 'close'
         Milestones::CloseService.new(project, current_user, {}).execute(milestone)