diff --git a/app/services/projects/fork_service.rb b/app/services/projects/fork_service.rb
index f2cdca409..3efd3e43c 100644
--- a/app/services/projects/fork_service.rb
+++ b/app/services/projects/fork_service.rb
@@ -21,6 +21,7 @@ class Projects::ForkService < ApplicationService
 
       new_repository = clone_project.repository
       new_repository.user = @target_owner
+      new_repository.identifier = @project.identifier
       new_repository.save!
 
       result = Gitea::Repository::ForkService.new(@project.owner, @target_owner, @project.identifier, @organization).call