diff --git a/net/socket/ssl_client_socket_impl.cc b/net/socket/ssl_client_socket_impl.cc
index fcd45cb5c..97cea09c1 100644
--- a/net/socket/ssl_client_socket_impl.cc
+++ b/net/socket/ssl_client_socket_impl.cc
@@ -13,6 +13,8 @@
 #include <memory>
 #include <utility>
 
+#include <__config>
+
 #include "base/containers/span.h"
 #include "base/feature_list.h"
 #include "base/functional/bind.h"