diff --git a/config/environments/development.rb b/config/environments/development.rb
index 25309d5a..cb7ebb18 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -78,4 +78,6 @@ Rails.application.configure do
   # Use an evented file watcher to asynchronously detect changes in source code,
   # routes, locales, etc. This feature depends on the listen gem.
   config.file_watcher = ActiveSupport::EventedFileUpdateChecker
+
+  config.hosts = nil
 end
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 3936b7d4..c5933fa7 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -57,4 +57,6 @@ Rails.application.configure do
   config.loadbalanced_configuration = false
 
   config.registration_method_default = config.registration_methods[:open]
+
+  config.hosts = nil
 end