diff --git a/ext/sockets/sockets.c b/ext/sockets/sockets.c
index 07d44b4d2db2a..bace1aae668dd 100644
--- a/ext/sockets/sockets.c
+++ b/ext/sockets/sockets.c
@@ -543,6 +543,9 @@ static PHP_MINIT_FUNCTION(sockets)
 	REGISTER_LONG_CONSTANT("SO_LISTENQLEN",       SO_LISTENQLEN,        CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("SO_USER_COOKIE",       SO_USER_COOKIE,        CONST_CS | CONST_PERSISTENT);
 #endif
+#ifdef SO_SETFIB
+	REGISTER_LONG_CONSTANT("SO_SETFIB",       SO_SETFIB,        CONST_CS | CONST_PERSISTENT);
+#endif
 #ifdef SO_ACCEPTFILTER
 	REGISTER_LONG_CONSTANT("SO_ACCEPTFILTER",       SO_ACCEPTFILTER,        CONST_CS | CONST_PERSISTENT);
 #endif