diff --git a/ext/sockets/sockets.c b/ext/sockets/sockets.c
index fec1a4aac120..6f3c0b681337 100644
--- a/ext/sockets/sockets.c
+++ b/ext/sockets/sockets.c
@@ -536,6 +536,12 @@ 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);
 	REGISTER_LONG_CONSTANT("SO_ACCEPTFILTER",       SO_ACCEPTFILTER,        CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SO_DONTTRUNC
+	REGISTER_LONG_CONSTANT("SO_DONTTRUNC",       SO_DONTTRUNC,        CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SO_WANTMORE
+	REGISTER_LONG_CONSTANT("SO_WANTMORE",       SO_WANTMORE,        CONST_CS | CONST_PERSISTENT);
 #endif
 	REGISTER_LONG_CONSTANT("SOL_SOCKET",	SOL_SOCKET,		CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("SOMAXCONN",		SOMAXCONN,		CONST_CS | CONST_PERSISTENT);