diff --git a/config/application.rb b/config/application.rb
index 45c2dcaf4..03c156ced 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -125,10 +125,6 @@ class Application < Rails::Application
     # https://github.com/alphagov/govuk-frontend/issues/1350
     config.assets.css_compressor = nil
 
-    # allow overriding the asset host with an enironment variable, useful for
-    # when router is proxying to this app but asset proxying isn't set up.
-    config.asset_host = ENV["ASSET_HOST"]
-
     # Do not swallow errors in after_commit/after_rollback callbacks.
     # config.active_record.raise_in_transactional_callbacks = true
   end