diff --git a/src/Contact/FriendSuggest/Exception/FriendSuggestPersistenceException.php b/src/Contact/FriendSuggest/Exception/FriendSuggestPersistenceException.php
index 3dcb36939f..daa2774505 100644
--- a/src/Contact/FriendSuggest/Exception/FriendSuggestPersistenceException.php
+++ b/src/Contact/FriendSuggest/Exception/FriendSuggestPersistenceException.php
@@ -23,7 +23,7 @@ namespace Friendica\Contact\FriendSuggest\Exception;
 
 class FriendSuggestPersistenceException extends \RuntimeException
 {
-	public function __construct($message = "", \Throwable $previous = null)
+	public function __construct($message = '', \Throwable $previous = null)
 	{
 		parent::__construct($message, 500, $previous);
 	}