diff --git a/sethostname.sh b/sethostname.sh
index 3e237d1..b79f7e4 100644
--- a/sethostname.sh
+++ b/sethostname.sh
@@ -1,8 +1,11 @@
-if [[ -f /sys/class/net/eth0/address ]]; then
+if [[ -f /sys/class/net/end0/address ]]; then
   ETHNAME=$(cat /sys/class/net/end0/address)
   BASED=end0
 else
   ETHNAME=$(cat /sys/class/net/eth0/address)
+  if [[ -z "$ETHNAME" ]]; then
+    ETHNAME=undefined
+  fi
   BASED=eth0
 fi
 FOUND=($(grep -l -r MAC=$ETHNAME /home/l_samenv/boxtools/cfg))