diff --git a/include/osmocom/msc/gsm_data.h b/include/osmocom/msc/gsm_data.h
index c5e7aaf..73047ee 100644
--- a/include/osmocom/msc/gsm_data.h
+++ b/include/osmocom/msc/gsm_data.h
@@ -23,6 +23,11 @@
 /* TS 48.008 DLCI containing DCCH/ACCH + SAPI */
 #define OMSC_LINKID_CB(__msgb)   (__msgb)->cb[3]
 
+#include "../../bscconfig.h"
+#if BUILD_IU
+#include <osmocom/ranap/iu_client.h>
+#endif
+
 /** annotations for msgb ownership */
 #define __uses
 
@@ -311,12 +316,14 @@
 		struct mgcp_client *client;
 	} mgw;
 
+#if BUILD_IU
 	struct {
 		/* CS7 instance id number (set via VTY) */
 		uint32_t cs7_instance;
-		int rab_assign_addr_enc;
+		enum ranap_nsap_addr_enc rab_assign_addr_enc;
 		struct osmo_sccp_instance *sccp;
 	} iu;
+#endif
 
 	struct {
 		/* CS7 instance id number (set via VTY) */
diff --git a/src/libmsc/msc_vty.c b/src/libmsc/msc_vty.c
index 84d4d14..d10028e 100644
--- a/src/libmsc/msc_vty.c
+++ b/src/libmsc/msc_vty.c
@@ -380,8 +380,14 @@
       "cs7-instance-iu <0-15>",
       "Set SS7 to be used by the Iu-Interface.\n" "SS7 instance reference number\n")
 {
+#if BUILD_IU
 	gsmnet->iu.cs7_instance = atoi(argv[0]);
 	return CMD_SUCCESS;
+#else
+	vty_out(vty, "WARNING: 'cs7-instance-iu' without effect: built without Iu support%s",
+		VTY_NEWLINE);
+	return CMD_WARNING;
+#endif
 }
 
 DEFUN(cfg_msc_auth_tuple_max_reuse_count, cfg_msc_auth_tuple_max_reuse_count_cmd,
@@ -437,8 +443,10 @@
 
 	vty_out(vty, " cs7-instance-a %u%s", gsmnet->a.cs7_instance,
 		VTY_NEWLINE);
+#if BUILD_IU
 	vty_out(vty, " cs7-instance-iu %u%s", gsmnet->iu.cs7_instance,
 		VTY_NEWLINE);
+#endif
 
 	if (gsmnet->vlr->cfg.auth_tuple_max_reuse_count)
 		vty_out(vty, " auth-tuple-max-reuse-count %d%s",
@@ -1422,7 +1430,7 @@
 
 	mgcp_client_vty_init(msc_network, MSC_NODE, &msc_network->mgw.conf);
 #ifdef BUILD_IU
-	ranap_iu_vty_init(MSC_NODE, (enum ranap_nsap_addr_enc*)&msc_network->iu.rab_assign_addr_enc);
+	ranap_iu_vty_init(MSC_NODE, &msc_network->iu.rab_assign_addr_enc);
 #endif
 	osmo_fsm_vty_add_cmds();
 
diff --git a/src/libvlr/Makefile.am b/src/libvlr/Makefile.am
index e3d5ced..1408f6c 100644
--- a/src/libvlr/Makefile.am
+++ b/src/libvlr/Makefile.am
@@ -6,6 +6,7 @@
 	   $(LIBOSMOSCCP_CFLAGS) \
 	   $(LIBOSMOMGCPCLIENT_CFLAGS) \
 	   $(LIBOSMOABIS_CFLAGS) \
+	   $(LIBOSMORANAP_CFLAGS) \
 	   $(COVERAGE_CFLAGS) \
 	   $(NULL)