diff --git a/frameworks/Ruby/rails/rails-iodine.dockerfile b/frameworks/Ruby/rails/rails-iodine.dockerfile
index ffa3b078dd0..b91de6b668d 100644
--- a/frameworks/Ruby/rails/rails-iodine.dockerfile
+++ b/frameworks/Ruby/rails/rails-iodine.dockerfile
@@ -24,4 +24,4 @@ ENV RAILS_ENV=production_postgresql
 ENV PORT=8080
 ENV REDIS_URL=redis://localhost:6379/0
 CMD service redis-server start && \
-    bundle exec iodine
+    bundle exec iodine -w $(ruby config/auto_tune.rb | grep -Eo '[0-9]+' | head -n 1)