diff --git a/include/osmocom/bsc/pcuif_proto.h b/include/osmocom/bsc/pcuif_proto.h
index 80d4f90..8f72602 100644
--- a/include/osmocom/bsc/pcuif_proto.h
+++ b/include/osmocom/bsc/pcuif_proto.h
@@ -2,6 +2,7 @@
 #define _PCUIF_PROTO_H
 
 #include <osmocom/gsm/l1sap.h>
+#include <arpa/inet.h>
 
 #define PCU_SOCK_DEFAULT	"/tmp/pcu_bts"
 
@@ -50,6 +51,11 @@
 #define PCU_IF_FLAG_MCS8	(1 << 27)
 #define PCU_IF_FLAG_MCS9	(1 << 28)
 
+/* NSVC address type */
+#define PCU_IF_ADDR_TYPE_UNSPEC	0x00	/* No address - empty entry */
+#define PCU_IF_ADDR_TYPE_IPV4	0x04	/* IPv4 address */
+#define PCU_IF_ADDR_TYPE_IPV6	0x29	/* IPv6 address */
+
 enum gsm_pcu_if_text_type {
 	PCU_VERSION,
 	PCU_OML_ALERT,
@@ -164,7 +170,11 @@
 	uint16_t	nsvci[2];
 	uint16_t	local_port[2];
 	uint16_t	remote_port[2];
-	uint32_t	remote_ip[2];
+	uint8_t		address_type[2];
+	union {
+		struct in_addr v4;
+		struct in6_addr v6;
+	} remote_ip[2];
 } __attribute__ ((packed));
 
 struct gsm_pcu_if_act_req {