diff --git a/src/Phois/Whois/Whois.php b/src/Phois/Whois/Whois.php
index 739de3c..b02e927 100644
--- a/src/Phois/Whois/Whois.php
+++ b/src/Phois/Whois/Whois.php
@@ -189,7 +189,7 @@ public function isValid()
         ) {
             $tmp_domain = strtolower($this->subDomain);
             if (
-                preg_match("/^[a-z0-9\-]{3,}$/", $tmp_domain)
+                preg_match("/^[a-z0-9\-]{2,}$/", $tmp_domain)
                 && !preg_match("/^-|-$/", $tmp_domain) //&& !preg_match("/--/", $tmp_domain)
             ) {
                 return true;