diff --git a/register.php b/register.php
index dbf6907..c38c59a 100644
--- a/register.php
+++ b/register.php
@@ -37,13 +37,16 @@ if (empty($_POST) === false) {
 			$errors[] = 'This account name is blocked for registration.';
 		}
 		if ($config['ServerEngine'] !== 'OTHIRE' && $config['client'] >= 830) {
-			if (preg_match("/^[a-zA-Z0-9]+$/", $_POST['username']) == false) {
-				$errors[] = 'Your account name can only contain characters a-z, A-Z and 0-9.';
-			}
+		    if (preg_match("/^[a-zA-Z0-9]+$/", $_POST['username']) == false) {
+		        $errors[] = 'Your account name can only contain characters a-z, A-Z and 0-9.';
+		    }
 		} else {
-			if (preg_match("/^[0-9]+$/", $_POST['username']) == false) {
-				$errors[] = 'Your account can only contain numbers 0-9.';
-			}
+		    if (preg_match("/^[0-9]+$/", $_POST['username']) == false) {
+		        $errors[] = 'Your account can only contain numbers 0-9.';
+		    }
+		    if ((int)$_POST['username'] < 100000 || (int)$_POST['username'] > 999999999) {
+		        $errors[] = 'Your account number must be a value between 6-8 numbers long.';
+		    }
 		}
 		// name restriction
 		$resname = explode(" ", $_POST['username']);