diff --git a/gisi/phonet.h b/gisi/phonet.h
index a3d3d7dd..6456e40b 100644
--- a/gisi/phonet.h
+++ b/gisi/phonet.h
@@ -32,6 +32,8 @@
 #define PN_PROTO_PHONET		1
 #define PN_PROTO_PIPE		2
 
+#define SOL_PNPIPE		275
+
 #define PNPIPE_ENCAP		1
 #define PNPIPE_IFINDEX		2