diff --git a/openbsc/src/libcommon/gsup_test_client.c b/openbsc/src/libcommon/gsup_test_client.c
index 1889c6f..861212a 100644
--- a/openbsc/src/libcommon/gsup_test_client.c
+++ b/openbsc/src/libcommon/gsup_test_client.c
@@ -7,6 +7,7 @@
 #include <osmocom/core/msgb.h>
 #include <osmocom/core/select.h>
 #include <osmocom/core/application.h>
+#include <osmocom/core/utils.h>
 #include <osmocom/gsm/gsup.h>
 
 #include <openbsc/gsup_client.h>
@@ -108,7 +109,7 @@
 	struct osmo_gsup_message gsup = {0};
 	struct msgb *msg = msgb_alloc_headroom(1200, 200, __func__);
 
-	strncpy(gsup.imsi, io->imsi, sizeof(gsup.imsi));
+	osmo_strlcpy(gsup.imsi, io->imsi, sizeof(gsup.imsi));
 	gsup.message_type = OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST;
 
 	osmo_gsup_encode(msg, &gsup);
@@ -123,7 +124,7 @@
 	struct osmo_gsup_message gsup = {0};
 	struct msgb *msg = msgb_alloc_headroom(1200, 200, __func__);
 
-	strncpy(gsup.imsi, io->imsi, sizeof(gsup.imsi));
+	osmo_strlcpy(gsup.imsi, io->imsi, sizeof(gsup.imsi));
 	gsup.message_type = OSMO_GSUP_MSGT_UPDATE_LOCATION_REQUEST;
 
 	osmo_gsup_encode(msg, &gsup);
@@ -136,7 +137,7 @@
 	struct osmo_gsup_message gsup = {0};
 	struct msgb *msg = msgb_alloc_headroom(1200, 200, __func__);
 
-	strncpy(gsup.imsi, io->imsi, sizeof(gsup.imsi));
+	osmo_strlcpy(gsup.imsi, io->imsi, sizeof(gsup.imsi));
 	gsup.message_type = OSMO_GSUP_MSGT_INSERT_DATA_RESULT;
 
 	osmo_gsup_encode(msg, &gsup);
diff --git a/openbsc/src/libmsc/vty_interface_layer3.c b/openbsc/src/libmsc/vty_interface_layer3.c
index edece51..4f412b1 100644
--- a/openbsc/src/libmsc/vty_interface_layer3.c
+++ b/openbsc/src/libmsc/vty_interface_layer3.c
@@ -601,7 +601,7 @@
 		return CMD_WARNING;
 	}
 
-	strncpy(subscr->extension, ext, sizeof(subscr->extension));
+	osmo_strlcpy(subscr->extension, ext, sizeof(subscr->extension));
 	db_sync_subscriber(subscr);
 
 	subscr_put(subscr);
diff --git a/openbsc/tests/mgcp/mgcp_test.c b/openbsc/tests/mgcp/mgcp_test.c
index e2dc8fa..b2d237e 100644
--- a/openbsc/tests/mgcp/mgcp_test.c
+++ b/openbsc/tests/mgcp/mgcp_test.c
@@ -25,6 +25,7 @@
 
 #include <osmocom/core/application.h>
 #include <osmocom/core/talloc.h>
+#include <osmocom/core/utils.h>
 #include <string.h>
 #include <limits.h>
 #include <dlfcn.h>
@@ -54,7 +55,7 @@
 	char buf[2048];
 	int counter = 0;
 
-	strncpy(buf, strline_test_data, sizeof(buf));
+	osmo_strlcpy(buf, strline_test_data, sizeof(buf));
 
 	for (line = strline_r(buf, &save); line;
 	     line = strline_r(NULL, &save)) {
diff --git a/openbsc/tests/sgsn/sgsn_test.c b/openbsc/tests/sgsn/sgsn_test.c
index b4bcaf6..fea635e 100644
--- a/openbsc/tests/sgsn/sgsn_test.c
+++ b/openbsc/tests/sgsn/sgsn_test.c
@@ -36,6 +36,7 @@
 #include <osmocom/core/application.h>
 #include <osmocom/core/msgb.h>
 #include <osmocom/core/rate_ctr.h>
+#include <osmocom/core/utils.h>
 
 #include <stdio.h>
 
@@ -1292,7 +1293,7 @@
 	rc = osmo_gsup_decode(msgb_data(msg), msgb_length(msg), &to_peer);
 	OSMO_ASSERT(rc >= 0);
 	OSMO_ASSERT(to_peer.imsi[0] != 0);
-	strncpy(from_peer.imsi, to_peer.imsi, sizeof(from_peer.imsi));
+	osmo_strlcpy(from_peer.imsi, to_peer.imsi, sizeof(from_peer.imsi));
 
 	/* This invalidates the pointers in to_peer */
 	msgb_free(msg);