diff --git a/snappymail/v/0.0.0/app/libraries/snappymail/sasl/oauth.php b/snappymail/v/0.0.0/app/libraries/snappymail/sasl/oauth.php
index cd73fb056..8a2c5ad2a 100644
--- a/snappymail/v/0.0.0/app/libraries/snappymail/sasl/oauth.php
+++ b/snappymail/v/0.0.0/app/libraries/snappymail/sasl/oauth.php
@@ -11,7 +11,7 @@ class OAuth extends \SnappyMail\SASL
 {
 	public function authenticate(string $username, string $passphrase, ?string $authzid = null) : string
 	{
-		return $this->encode("user={$username}\x01auth=Bearer {$passphrase}\x01\x01");
+		return $this->encode("n,a={$username},\x01auth=Bearer {$passphrase}\x01\x01");
 	}
 
 	public static function isSupported(string $param) : bool