diff --git a/src/config.h.in b/src/config.h.in
index 4720a1e7b4..7f6efc27e0 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -26,6 +26,9 @@
 /* Define if you have the <sys/select.h> header file */
 #undef HAVE_SYS_SELECT_H
 
+/* Define if you have the <sys/socket.h> header file */
+#undef HAVE_SYS_SOCKET_H
+
 /* Define if you have the <sys/poll.h> header file */
 #undef HAVE_SYS_POLL_H