diff --git a/config/boot.rb b/config/boot.rb
index bd2082ee3..70f90871e 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -8,6 +8,7 @@
 Config.setup do |config|
   config.const_name = 'Settings'
   config.use_env = true
+  config.env_separator = '__'
 end
 
 Config.load_and_set_settings(Config.setting_files(__dir__, ENV.fetch('TRAJECT_ENV', nil)))