diff --git a/back/app/services/project_copy_service.rb b/back/app/services/project_copy_service.rb
index 9bc17b36e0ed..38b433ef2c77 100644
--- a/back/app/services/project_copy_service.rb
+++ b/back/app/services/project_copy_service.rb
@@ -714,7 +714,7 @@ def yml_followers(exported_ideas, shift_timestamps: 0)
 
     followers.map do |follower|
       {
-        'followable_ref' => lookup_ref(follower.followable_id, %i[project]),
+        'followable_ref' => lookup_ref(follower.followable_id, %i[project idea]),
         'user_ref' => lookup_ref(follower.user_id, :user),
         'created_at' => shift_timestamp(follower.created_at, shift_timestamps)&.iso8601,
         'updated_at' => shift_timestamp(follower.updated_at, shift_timestamps)&.iso8601