diff --git a/preconf.sh b/preconf.sh
index c1787c6..996dbef 100644
--- a/preconf.sh
+++ b/preconf.sh
@@ -18,6 +18,7 @@ openssl dhparam -dsaparam -out /etc/acmesh/certs/ssl-dhparams.pem 4096 > $OUTPUT
 #openssl dhparam -out /etc/acmesh/certs/ssl-dhparams.pem 2048 #use for quick generation, only for testing
 
 /opt/acmesh/acme.sh --home "/opt/acmesh/" --config-home "/etc/acmesh/data" --upgrade > $OUTPUT 2>&1
+/opt/acmesh/acme.sh --config-home "/etc/acmesh/data" --set-default-ca  --server  letsencrypt
 /opt/acmesh/acme.sh --config-home "/etc/acmesh/data" --register-account > $OUTPUT 2>&1
 /opt/acmesh/acme.sh --config-home "/etc/acmesh/data" --update-account --accountemail "$email" > $OUTPUT 2>&1