diff --git a/bgpd/bgp_aspath.h b/bgpd/bgp_aspath.h
index b467ee5..aa13daa 100644
--- a/bgpd/bgp_aspath.h
+++ b/bgpd/bgp_aspath.h
@@ -41,6 +41,10 @@
 /* Transition 16Bit AS as defined by IANA */
 #define BGP_AS_TRANS		 23456U
 
+#define BGP_AS_IS_PRIVATE(ASN) \
+    (((ASN) >= BGP_PRIVATE_AS_MIN && (ASN) <= BGP_PRIVATE_AS_MAX) || \
+     ((ASN) >= BGP_PRIVATE_AS4_MIN && (ASN) <= BGP_PRIVATE_AS4_MAX))
+
 /* AS_PATH segment data in abstracted form, no limit is placed on length */
 struct assegment
 {