diff --git a/app/models/deploy_local.rb b/app/models/deploy_local.rb
index f9225f39..4fa588f5 100644
--- a/app/models/deploy_local.rb
+++ b/app/models/deploy_local.rb
@@ -68,7 +68,7 @@ class DeployLocal < Deploy
   end
 
   def yarn_cache_dir
-    Rails.root.join('_yarn_cache')
+    Rails.root.join('_yarn_cache').to_s
   end
 
   def yarn_lock