diff --git a/read.php b/read.php
index f1589ee3..64fee794 100644
--- a/read.php
+++ b/read.php
@@ -17,7 +17,7 @@ $pages = array(
 	'/(\%b)/' . preg_quote($config['file_index'], '!')					=> 'view_board',
 	'/(\%b)/' . str_replace('%d', '(\d+)', preg_quote($config['file_page'], '!'))		=> 'view_board',
 	'/(\%b)/' . preg_quote($config['dir']['res'], '!') .
-			str_replace('%d', '(\d+)', preg_quote($config['file_page50'], '!'))	=> 'view_thread50',
+			str_replace('%d', '(\d+)', '%d\+50(\.html)?')	=> 'view_thread50',
 	'/(\%b)/' . preg_quote($config['dir']['res'], '!') .
 			str_replace('%d', '(\d+)', '%d(\.html)?')	=> 'view_thread',
 );