diff --git a/allow-cyrillic-usernames.php b/allow-cyrillic-usernames.php
index 0880560..ec2ef55 100644
--- a/allow-cyrillic-usernames.php
+++ b/allow-cyrillic-usernames.php
@@ -26,5 +26,30 @@ function acu_sanitize_user($username, $raw_username, $strict) {
 
 	return $username;
 }
+
+function acu_pre_user_create($data, $update, $id, $userdata) {
+	if (mb_strlen($data['user_nicename']) > 50) {
+		$data['user_nicename'] = mb_substr(cyrlat($data['user_login']),0,50);
+	}
+	return $data;
+}
+
+function cyrlat($text) {
+	$cyr = [
+		'а','б','в','г','д','е','ё','ж','з','и','й','к','л','м','н','о','п',
+		'р','с','т','у','ф','х','ц','ч','ш','щ','ъ','ы','ь','э','ю','я',
+		'А','Б','В','Г','Д','Е','Ё','Ж','З','И','Й','К','Л','М','Н','О','П',
+		'Р','С','Т','У','Ф','Х','Ц','Ч','Ш','Щ','Ъ','Ы','Ь','Э','Ю','Я'
+	];
+	$lat = [
+			'a','b','v','g','d','e','io','zh','z','i','y','k','l','m','n','o','p',
+			'r','s','t','u','f','h','ts','ch','sh','sht','a','i','y','e','yu','ya',
+			'A','B','V','G','D','E','Io','Zh','Z','I','Y','K','L','M','N','O','P',
+			'R','S','T','U','F','H','Ts','Ch','Sh','Sht','A','I','Y','e','Yu','Ya'
+	];
+	return str_replace($cyr, $lat, $text);
+}
+
 add_filter('sanitize_user', 'acu_sanitize_user', 10, 3);
-?>
\ No newline at end of file
+add_filter('wp_pre_insert_user_data', 'acu_pre_user_create', 10, 4);
+?>