diff --git a/railties/lib/rails/generators/rails/app/templates/config/databases/postgresql.yml b/railties/lib/rails/generators/rails/app/templates/config/databases/postgresql.yml
index d51b2ec199..bd5c0b10f6 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/databases/postgresql.yml
+++ b/railties/lib/rails/generators/rails/app/templates/config/databases/postgresql.yml
@@ -19,7 +19,7 @@ default: &default
   encoding: unicode
   # For details on connection pooling, see rails configuration guide
   # http://guides.rubyonrails.org/configuring.html#database-pooling
-  pool: 5
+  pool: <%%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
 
 development:
   <<: *default