diff --git a/networking/udhcp/leases.c b/networking/udhcp/leases.c
index 4999d8079..fad71ec6c 100644
--- a/networking/udhcp/leases.c
+++ b/networking/udhcp/leases.c
@@ -60,6 +60,8 @@ struct dyn_lease* FAST_FUNC add_lease(
 		memset(oldest, 0, sizeof(*oldest));
 		if (hostname) {
 			char *p;
+
+			hostname_len++; /* include NUL */
 			if (hostname_len > sizeof(oldest->hostname))
 				hostname_len = sizeof(oldest->hostname);
 			p = safe_strncpy(oldest->hostname, hostname, hostname_len);