diff --git a/server/lib/classes/letsencrypt.inc.php b/server/lib/classes/letsencrypt.inc.php
index af770723f590ddc94b47fbe0a30d5c5d327ffa11..7d5194cf39c4bbcdd87293688e3d6d58b6b24851 100644
--- a/server/lib/classes/letsencrypt.inc.php
+++ b/server/lib/classes/letsencrypt.inc.php
@@ -227,7 +227,7 @@ class letsencrypt {
 		// check if domains are reachable to avoid letsencrypt verification errors
 		$le_rnd_file = uniqid('le-') . '.txt';
 		$le_rnd_hash = md5(uniqid('le-', true));
-		if(!is_dir('/usr/local/interface/acme/.well-known/acme-challenge/')) {
+		if(!is_dir('/usr/local/ispconfig/interface/acme/.well-known/acme-challenge/')) {
 			$app->system->mkdir('/usr/local/ispconfig/interface/acme/.well-known/acme-challenge/', false, 0755, true);
 		}
 		file_put_contents('/usr/local/ispconfig/interface/acme/.well-known/acme-challenge/' . $le_rnd_file, $le_rnd_hash);