diff --git a/config/environments/development.rb b/config/environments/development.rb
index 1512c020b..c6f75a1c6 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -57,7 +57,7 @@
   # config.action_view.annotate_rendered_view_with_filenames = true
 
   # Provide a default host for URLs
-  Rails.application.routes.default_url_options[:host] = ENV.fetch('OSEM_HOSTNAME', 'localhost:3000')
+  config.routes.default_url_options[:host] = ENV.fetch('OSEM_HOSTNAME', 'localhost:3000')
   config.action_controller.default_url_options = Rails.application.routes.default_url_options
   config.action_mailer.default_url_options = Rails.application.routes.default_url_options
 
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 59431a74d..e1d230372 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -115,7 +115,7 @@
   end
 
   # Provide a default host for URLs
-  Rails.application.routes.default_url_options[:host] = ENV.fetch('OSEM_HOSTNAME', 'localhost:3000')
+  config.routes.default_url_options[:host] = ENV.fetch('OSEM_HOSTNAME', 'localhost:3000')
   config.action_controller.default_url_options = Rails.application.routes.default_url_options
   config.action_mailer.default_url_options = Rails.application.routes.default_url_options
 
diff --git a/config/environments/test.rb b/config/environments/test.rb
index a7723d22d..402118b92 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -44,7 +44,7 @@
   config.active_support.disallowed_deprecation_warnings = []
 
   # Provide a default host for URLs
-  Rails.application.routes.default_url_options[:host] = 'localhost:3000'
+  config.routes.default_url_options[:host] = 'localhost:3000'
   config.action_controller.default_url_options = Rails.application.routes.default_url_options
   config.action_mailer.default_url_options = Rails.application.routes.default_url_options