diff --git a/Sources/Parsers/MarkdownParser.php b/Sources/Parsers/MarkdownParser.php
index 9651b0d17d0..c22a5315d11 100644
--- a/Sources/Parsers/MarkdownParser.php
+++ b/Sources/Parsers/MarkdownParser.php
@@ -1143,8 +1143,8 @@ protected function analyzeLine(array $line_info): array
 	{
 		$this->findOpen();
 
-		$line_info['indent'] = strspn($line_info['string'], ' ');
-		$line_info['content'] = substr($line_info['string'], $line_info['indent']);
+		$line_info['indent'] = strspn(strtr($line_info['string'], ["\u{2000}" =>  ' ']), ' ');
+		$line_info['content'] = mb_substr($line_info['string'], $line_info['indent']);
 
 		// Figure out which block types this line could open.
 		$line_info['possible_types'] = [];