diff --git a/lib/install.sh b/lib/install.sh
index c10517e..341c2de 100755
--- a/lib/install.sh
+++ b/lib/install.sh
@@ -397,12 +397,14 @@ function miaou_resolver() {
 
     if ! grep -q "nameserver $bridge" /etc/resolv.conf; then
         echo -n "customize resolv.conf from scratch with bridge=<$bridge>, resolver=<$resolver> ..."
+        sudo chattr -i /etc/resolv.conf
         sudo tee /etc/resolv.conf &>/dev/null <<EOF
 # generated by miaou            
 nameserver $bridge # LXD bridge
 nameserver $resolver # resolver
 EOF
         PREFIX="" echoinfo DONE
+        sudo chattr +i /etc/resolv.conf
     else
         echo "customize resolv.conf already defined!"
     fi