diff --git a/config/deploy.yml b/config/deploy.yml
index 8634645..0a85871 100644
--- a/config/deploy.yml
+++ b/config/deploy.yml
@@ -3,7 +3,7 @@ image: paganotoni/todox
 servers:
   web:
     hosts:
-      - <%= ENV['PRODUCTION_SERVER_IP'] %>
+      - <%= ENV.fetch('PRODUCTION_SERVER_IP') %>
     options:
       "add-host": host.docker.internal:host-gateway
     labels: