diff --git a/lib/private/Authentication/Token/DefaultTokenProvider.php b/lib/private/Authentication/Token/DefaultTokenProvider.php
index a60c8b85b0807..c10d7f17bc2af 100644
--- a/lib/private/Authentication/Token/DefaultTokenProvider.php
+++ b/lib/private/Authentication/Token/DefaultTokenProvider.php
@@ -71,21 +71,12 @@ public function __construct(DefaultTokenMapper $mapper,
 	}
 
 	/**
-	 * Create and persist a new token
-	 *
-	 * @param string $token
-	 * @param string $uid
-	 * @param string $loginName
-	 * @param string|null $password
-	 * @param string $name
-	 * @param int $type token type
-	 * @param int $remember whether the session token should be used for remember-me
-	 * @return IToken
+	 * {@inheritDoc}
 	 */
 	public function generateToken(string $token,
 								  string $uid,
 								  string $loginName,
-								  $password,
+								  ?string $password,
 								  string $name,
 								  int $type = IToken::TEMPORARY_TOKEN,
 								  int $remember = IToken::DO_NOT_REMEMBER): IToken {
diff --git a/lib/private/Authentication/Token/IProvider.php b/lib/private/Authentication/Token/IProvider.php
index b37fc2c8cf4d0..e604ac715c24c 100644
--- a/lib/private/Authentication/Token/IProvider.php
+++ b/lib/private/Authentication/Token/IProvider.php
@@ -53,7 +53,7 @@ interface IProvider {
 	public function generateToken(string $token,
 								  string $uid,
 								  string $loginName,
-								  $password,
+								  ?string $password,
 								  string $name,
 								  int $type = IToken::TEMPORARY_TOKEN,
 								  int $remember = IToken::DO_NOT_REMEMBER): IToken;
diff --git a/lib/private/Authentication/Token/PublicKeyTokenProvider.php b/lib/private/Authentication/Token/PublicKeyTokenProvider.php
index e814931990496..22c62d82fac05 100644
--- a/lib/private/Authentication/Token/PublicKeyTokenProvider.php
+++ b/lib/private/Authentication/Token/PublicKeyTokenProvider.php
@@ -80,7 +80,7 @@ public function __construct(PublicKeyTokenMapper $mapper,
 	public function generateToken(string $token,
 								  string $uid,
 								  string $loginName,
-								  $password,
+								  ?string $password,
 								  string $name,
 								  int $type = IToken::TEMPORARY_TOKEN,
 								  int $remember = IToken::DO_NOT_REMEMBER): IToken {