diff --git a/framework/vendors/markdown/markdown.php b/framework/vendors/markdown/markdown.php
index 9ae90a846d..2ff8717172 100644
--- a/framework/vendors/markdown/markdown.php
+++ b/framework/vendors/markdown/markdown.php
@@ -1447,8 +1447,8 @@ protected function utf8_strlen($string) {
 		}
 
 		return preg_match_all(
-			"/[\x00-\xBF]|[\xC0-\xFF][\x80-\xBF]*/",
-			$text,
+			'/[\x00-\xBF]|[\xC0-\xFF][\x80-\xBF]*/',
+			$string,
 			$m
 		);
 	}