diff --git a/Dockerfile b/Dockerfile
index 3eefaed..c7bd930 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -22,13 +22,13 @@ RUN bundle install
 # Params
 ARG RAILS_ENV="production"
 ARG RAILS_SERVE_STATIC_FILES="true"
-ARG RELATIVE_URL_ROOT="/app/root"
+ARG RAILS_RELATIVE_URL_ROOT="/app/root"
 
 # Set environment variables and expose the running port
 ENV RAILS_ENV=$RAILS_ENV
 ENV RAILS_SERVE_STATIC_FILES=$RAILS_SERVE_STATIC_FILES
-ENV RELATIVE_URL_ROOT=$RELATIVE_URL_ROOT
-ENV SCRIPT_NAME=$RELATIVE_URL_ROOT
+ENV RAILS_RELATIVE_URL_ROOT=$RAILS_RELATIVE_URL_ROOT
+ENV SCRIPT_NAME=$RAILS_RELATIVE_URL_ROOT
 EXPOSE 3000
 
 # Precompile assets and add entrypoint script
diff --git a/config/environments/production.rb b/config/environments/production.rb
index f93cc0e..b463819 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -78,7 +78,7 @@
 
   config.logger = JsonRailsLogger::Logger.new($stdout)
 
-  config.relative_url_root = ENV['RELATIVE_URL_ROOT'] || '/'
+  config.relative_url_root = ENV['RAILS_RELATIVE_URL_ROOT'] || '/'
 
   config.accessibility_document_path = '/accessibility'
   config.privacy_document_path = '/privacy'