diff --git a/config/environments/production.rb b/config/environments/production.rb
index 8f86fdaa..f812d4b1 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -32,7 +32,7 @@ Rails.application.configure do
   # config.logger = SyslogLogger.new
 
   # Use a different cache store in production
-  config.cache_store = :mem_cache_store, namespace: "openneo-impress-rails"
+  config.cache_store = :mem_cache_store, { namespace: "openneo-impress-rails" }
 
   # Disable Rails's static asset server
   # In production, Apache or nginx will already do this