diff --git a/config/rootfiles/core/175/update.sh b/config/rootfiles/core/175/update.sh
index 82676bc72..f1c6873c1 100644
--- a/config/rootfiles/core/175/update.sh
+++ b/config/rootfiles/core/175/update.sh
@@ -191,6 +191,9 @@ if [ -s /var/ipfire/ovpn/ovpnconfig ]; then
        done
 fi
 
+## Add unique_subject = yes to vpn index.txt.attr file
+echo "unique_subject = yes" > /var/ipfire/certs/index.txt.attr
+
 # This update needs a reboot...
 touch /var/run/need_reboot