Index: plugin.php
===================================================================
--- plugin.php	(revision 5043)
+++ plugin.php	(working copy)
@@ -26,7 +26,7 @@
 		foreach( (array) current($wp_filter[$tag]) as $the_ )
 			if ( !is_null($the_['function']) ){
 				$args[1] = $string;
-				$string = call_user_func_array($the_['function'], array_slice($args, 1, (int) $the_['accepted_args']));
+				$string = call_user_func_array($the_['function'], array_slice($args, 1, (int) $the_['accepted_args'] + 1));
 			}
 
 	} while ( next($wp_filter[$tag]) );