diff --git a/bin/letsencrypt-certonly.sh b/bin/letsencrypt-certonly.sh
index 7659a5f..dffc9cf 100755
--- a/bin/letsencrypt-certonly.sh
+++ b/bin/letsencrypt-certonly.sh
@@ -69,10 +69,10 @@ fi
 # set vars
 command="certbot certonly"
 if [[ -n $dnstxt ]]; then
-  if [[ -f /usr/local/etc/pdns-credentials.ini ]]; then
-    command="$command --authenticator certbot-dns-powerdns:dns-powerdns --certbot-dns-powerdns:dns-powerdns-credentials /usr/local/etc/pdns-credentials.ini --certbot-dns-powerdns:dns-powerdns-propagation-seconds 3"
+  if [[ -f /usr/local/etc/pdns-certbot-credentials.ini ]]; then
+    command="$command --authenticator dns-powerdns --dns-powerdns-credentials /usr/local/etc/pdns-certbot-credentials.ini --dns-powerdns-propagation-seconds 3"
   else
-    echo "ERROR: /usr/local/etc/pdns-credentials.ini config file does not exist, can't use -t (DNS TXT authenticator)."
+    echo "ERROR: /usr/local/etc/pdns-certbot-credentials.ini config file does not exist, can't use -t (DNS TXT authenticator)."
     exit 1
   fi
 else