diff --git a/config/environments/development.rb b/config/environments/development.rb
index ddf0e90..a4f6438 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -16,6 +16,9 @@ Rails.application.configure do
   # Don't care if the mailer can't send.
   config.action_mailer.raise_delivery_errors = false
 
+  # Use localhost for default host
+  config.action_mailer.default_url_options = {host: 'localhost:3000'}
+
   # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log
 
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 053f5b6..4e03964 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -31,6 +31,9 @@ Rails.application.configure do
   # ActionMailer::Base.deliveries array.
   config.action_mailer.delivery_method = :test
 
+  # Use localhost for default host
+  config.action_mailer.default_url_options = {host: 'localhost:3000'}
+
   # Print deprecation notices to the stderr.
   config.active_support.deprecation = :stderr