diff --git a/include/linux/socket.h b/include/linux/socket.h
index 818ca33..20fc4bb 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -297,6 +297,7 @@
 #define SOL_RXRPC	272
 #define SOL_PPPOL2TP	273
 #define SOL_BLUETOOTH	274
+#define SOL_PNPIPE	275
 
 /* IPX options */
 #define IPX_TYPE	1