diff --git a/src/psm/Util/Server/ServerValidator.php b/src/psm/Util/Server/ServerValidator.php
index b4108824..d4b89aee 100644
--- a/src/psm/Util/Server/ServerValidator.php
+++ b/src/psm/Util/Server/ServerValidator.php
@@ -89,7 +89,7 @@ class ServerValidator {
 		switch ($type) {
 			case 'website':
 				// url regex as per https://stackoverflow.com/a/3809435
-				if (!preg_match("/(http(s)?:\/\/.)?(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&\/\/=]*)/g", $value)) {
+				if (!preg_match("/(http(s)?:\/\/.)?(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,12}\b([-a-zA-Z0-9@:%_\+.~#?&\/\/=]*)/g", $value)) {
 					throw new \InvalidArgumentException('server_ip_bad_website');
 				}
 				break;