diff --git a/include/curl/curlbuild.h b/include/curl/curlbuild.h
index f0abe84..b5ad6bc 100644
--- a/include/curl/curlbuild.h
+++ b/include/curl/curlbuild.h
@@ -53,6 +53,8 @@
  *
  */
 
+#include <nsysnet/socket.h>
+
 /* ================================================================ */
 /*  DEFINITION OF THESE SYMBOLS SHALL NOT TAKE PLACE ANYWHERE ELSE  */
 /* ================================================================ */