diff --git a/htdocs/includes/parsedown/Parsedown.php b/htdocs/includes/parsedown/Parsedown.php
index 3b30c02af48..2a00db26087 100644
--- a/htdocs/includes/parsedown/Parsedown.php
+++ b/htdocs/includes/parsedown/Parsedown.php
@@ -571,7 +571,7 @@ class Parsedown
 	#
 	# List
 
-	protected function blockList($Line, ?array $CurrentBlock = null)
+	protected function blockList($Line, $CurrentBlock = null)
 	{
 		list($name, $pattern) = $Line['text'][0] <= '-' ? array('ul', '[*+-]') : array('ol', '[0-9]{1,9}+[.\)]');
 
@@ -808,7 +808,7 @@ class Parsedown
 	#
 	# Setext
 
-	protected function blockSetextHeader($Line, ?array $Block = null)
+	protected function blockSetextHeader($Line, $Block = null)
 	{
 		if ( ! isset($Block) or $Block['type'] !== 'Paragraph' or isset($Block['interrupted']))
 		{