diff --git a/railties/lib/rails/generators/rails/app/templates/config/puma.rb.tt b/railties/lib/rails/generators/rails/app/templates/config/puma.rb.tt
index be653c9c4cd..ec35fc10b35 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/puma.rb.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/puma.rb.tt
@@ -13,7 +13,7 @@ threads min_threads_count, max_threads_count
 
 # Specifies that the worker count should equal the number of processors in production.
 if ENV["RAILS_ENV"] == "production"
-  worker_count = ENV.fetch("WEB_CONCURRENCY") { Concurrent.physical_processor_count }
+  worker_count = Integer(ENV.fetch("WEB_CONCURRENCY") { Concurrent.physical_processor_count })
   workers worker_count if worker_count > 1
 end