diff --git a/bacnet-stack/ports/linux/ethernet.c b/bacnet-stack/ports/linux/ethernet.c
index 3fbf78d9..218742cd 100644
--- a/bacnet-stack/ports/linux/ethernet.c
+++ b/bacnet-stack/ports/linux/ethernet.c
@@ -130,7 +130,7 @@ static int ethernet_bind(struct sockaddr *eth_addr, char *interface_name)
     /* Clear the memory before copying */
     memset(eth_addr->sa_data, '\0', sizeof(eth_addr->sa_data));
     /* Strcpy the interface name into the address */
-    strncpy(eth_addr->sa_data, interface_name, IFNAMSIZ);
+    strncpy(eth_addr->sa_data, interface_name, sizeof(eth_addr->sa_data)-1);
     fprintf(stderr,"ethernet: binding \"%s\"\n",eth_addr->sa_data);
     /* Attempt to bind the socket to the interface */
     if (bind(sock_fd, eth_addr, sizeof(struct sockaddr)) != 0)