diff --git a/db/post_migrate/20170502101023_cleanup_namespaceless_pending_delete_projects.rb b/db/post_migrate/20170502101023_cleanup_namespaceless_pending_delete_projects.rb
index 2d242da9ef8..ce52de91cdd 100644
--- a/db/post_migrate/20170502101023_cleanup_namespaceless_pending_delete_projects.rb
+++ b/db/post_migrate/20170502101023_cleanup_namespaceless_pending_delete_projects.rb
@@ -30,7 +30,7 @@ class CleanupNamespacelessPendingDeleteProjects < ActiveRecord::Migration
   private
 
   def pending_delete_batch
-    connection.exec_query(find_batch).map{ |row| row['id'] }
+    connection.exec_query(find_batch).map{ |row| row['id'].to_i }
   end
 
   BATCH_SIZE = 5000
diff --git a/spec/migrations/cleanup_namespaceless_pending_delete_projects_spec.rb b/spec/migrations/cleanup_namespaceless_pending_delete_projects_spec.rb
index 0b8af5010ba..49e750a3f4d 100644
--- a/spec/migrations/cleanup_namespaceless_pending_delete_projects_spec.rb
+++ b/spec/migrations/cleanup_namespaceless_pending_delete_projects_spec.rb
@@ -15,7 +15,7 @@ describe CleanupNamespacelessPendingDeleteProjects do
       project = build(:empty_project, pending_delete: true, namespace_id: nil)
       project.save(validate: false)
 
-      expect(NamespacelessProjectDestroyWorker).to receive(:bulk_perform_async).with([[project.id.to_s]])
+      expect(NamespacelessProjectDestroyWorker).to receive(:bulk_perform_async).with([[project.id]])
 
       described_class.new.up
     end