--- a/localip.c
+++ b/localip.c
@@ -58,7 +58,7 @@
    } else {
       /* Warn about changed address. */
       if (!addr_equal(ips->addrs + *idx, a)) {
-         static char before[INET6_ADDRSTRLEN];
+         static char before[INET6_ADDRSTRLEN + 1];
          strncpy(before, addr_to_str(ips->addrs + *idx), INET6_ADDRSTRLEN);
          verbosef("interface '%s' address %d/%d changed from %s to %s",
             iface, *idx+1, ips->num_addrs, before, addr_to_str(a));