diff --git a/zephyr/subsys/bacnet_datalink/bip-init.c b/zephyr/subsys/bacnet_datalink/bip-init.c
index 79dc4d9..0f264b4 100644
--- a/zephyr/subsys/bacnet_datalink/bip-init.c
+++ b/zephyr/subsys/bacnet_datalink/bip-init.c
@@ -626,7 +626,7 @@ static int createSocket(struct sockaddr_in *sin)
  * @return True if the socket is successfully opened for BACnet/IP,
  *        else False if the socket functions fail.
  */
-bool bip_init(char *ifname)
+bool bip_init(const char *ifname)
 {
     int sock_fd;
     struct sockaddr_in sin = { 0 };
diff --git a/zephyr/subsys/bacnet_datalink/bip6-init.c b/zephyr/subsys/bacnet_datalink/bip6-init.c
index 88b2af4..52306c6 100644
--- a/zephyr/subsys/bacnet_datalink/bip6-init.c
+++ b/zephyr/subsys/bacnet_datalink/bip6-init.c
@@ -445,7 +445,7 @@ void bip6_cleanup(void)
  * @return True if the socket is successfully opened for BACnet/IP,
  *         else False if the socket functions fail.
  */
-bool bip6_init(char *ifname)
+bool bip6_init(const char *ifname)
 {
     int status = -1;
     struct sockaddr_in6 server = { 0 };