diff --git a/lib/uri.rb b/lib/uri.rb
index 282e82c32c..539365af98 100644
--- a/lib/uri.rb
+++ b/lib/uri.rb
@@ -100,6 +100,7 @@ require_relative 'uri/https'
 require_relative 'uri/ldap'
 require_relative 'uri/ldaps'
 require_relative 'uri/mailto'
+require_relative 'uri/ws'
 
 module URI
   INITIAL_SCHEMES = scheme_list