diff --git a/libc/include/sys/socket.h b/libc/include/sys/socket.h
index f4e88e98..aaf7b920 100644
--- a/libc/include/sys/socket.h
+++ b/libc/include/sys/socket.h
@@ -107,6 +107,11 @@ struct linger
 #define AF_INET6	2
 #define AF_UNIX		3
 
+#define PF_UNSPEC	AF_UNSPEC
+#define PF_INET		AF_INET
+#define PF_INET6	AF_INET6
+#define PF_UNIX		AF_UNIX
+
 #define SHUT_RD		0x01
 #define SHUT_WR		0x02
 #define SHUT_RDWR	(SHUT_RD | SHUT_WR)