diff --git a/lib/async/http/endpoint.rb b/lib/async/http/endpoint.rb
index 2140b07a..45971711 100644
--- a/lib/async/http/endpoint.rb
+++ b/lib/async/http/endpoint.rb
@@ -7,6 +7,7 @@
 require 'async/io/host_endpoint'
 require 'async/io/ssl_endpoint'
 require 'async/io/ssl_socket'
+require 'async/io/shared_endpoint'
 
 require_relative 'protocol/http1'
 require_relative 'protocol/https'