diff --git a/openbsc/src/nat/bsc_nat_utils.c b/openbsc/src/nat/bsc_nat_utils.c
index e11b48c..89d7d4b 100644
--- a/openbsc/src/nat/bsc_nat_utils.c
+++ b/openbsc/src/nat/bsc_nat_utils.c
@@ -28,6 +28,7 @@
 #include <openbsc/gsm_data.h>
 #include <openbsc/debug.h>
 #include <openbsc/ipaccess.h>
+#include <openbsc/vty.h>
 
 #include <osmocore/linuxlist.h>
 #include <osmocore/talloc.h>
@@ -100,9 +101,7 @@
 
 void bsc_nat_set_msc_ip(struct bsc_nat *nat, const char *ip)
 {
-	if (nat->msc_ip)
-		talloc_free(nat->msc_ip);
-	nat->msc_ip = talloc_strdup(nat, ip);
+	bsc_replace_string(nat, &nat->msc_ip, ip);
 }
 
 struct bsc_connection *bsc_connection_alloc(struct bsc_nat *nat)
diff --git a/openbsc/src/nat/bsc_nat_vty.c b/openbsc/src/nat/bsc_nat_vty.c
index 1dbc755..9822e5c 100644
--- a/openbsc/src/nat/bsc_nat_vty.c
+++ b/openbsc/src/nat/bsc_nat_vty.c
@@ -368,9 +368,7 @@
       "token TOKEN",
       "Set a token for the NAT")
 {
-	if (_nat->token)
-		talloc_free(_nat->token);
-	_nat->token = talloc_strdup(_nat, argv[0]);
+	bsc_replace_string(_nat, &_nat->token, argv[0]);
 	return CMD_SUCCESS;
 }
 
@@ -393,9 +391,7 @@
       "Set the name of the access list to use.\n"
       "The name of the to be used access list.")
 {
-	if (_nat->acc_lst_name)
-		talloc_free(_nat->acc_lst_name);
-	_nat->acc_lst_name = talloc_strdup(_nat, argv[0]);
+	bsc_replace_string(_nat, &_nat->acc_lst_name, argv[0]);
 	return CMD_SUCCESS;
 }
 
@@ -428,9 +424,7 @@
 {
 	struct bsc_config *conf = vty->index;
 
-	if (conf->token)
-	    talloc_free(conf->token);
-	conf->token = talloc_strdup(conf, argv[0]);
+	bsc_replace_string(conf, &conf->token, argv[0]);
 	return CMD_SUCCESS;
 }
 
@@ -559,9 +553,7 @@
 {
 	struct bsc_config *conf = vty->index;
 
-	if (conf->acc_lst_name)
-		talloc_free(conf->acc_lst_name);
-	conf->acc_lst_name = talloc_strdup(conf, argv[0]);
+	bsc_replace_string(conf, &conf->acc_lst_name, argv[0]);
 	return CMD_SUCCESS;
 }
 
@@ -587,9 +579,7 @@
 {
 	struct bsc_config *conf = vty->index;
 
-	if (conf->description)
-		talloc_free(conf->description);
-	conf->description = talloc_strdup(conf, argv[0]);
+	bsc_replace_string(conf, &conf->description, argv[0]);
 	return CMD_SUCCESS;
 }