diff --git a/railties/lib/rails/commands/server/server_command.rb b/railties/lib/rails/commands/server/server_command.rb
index 98114e38a6e91..c94b6b216037d 100644
--- a/railties/lib/rails/commands/server/server_command.rb
+++ b/railties/lib/rails/commands/server/server_command.rb
@@ -6,6 +6,7 @@
 require "active_support/core_ext/string/filters"
 require "rails/dev_caching"
 require "rails/command/environment_argument"
+require "rack/server"
 
 module Rails
   class Server < ::Rack::Server