diff --git a/include/osmocom/msc/iucs.h b/include/osmocom/msc/iucs.h
index 2a70c65..302edc0 100644
--- a/include/osmocom/msc/iucs.h
+++ b/include/osmocom/msc/iucs.h
@@ -2,6 +2,8 @@
 
 #include <osmocom/msc/transaction.h>
 
+struct ranap_ue_conn_ctx;
+
 int gsm0408_rcvmsg_iucs(struct gsm_network *network, struct msgb *msg,
 			uint16_t *lac);