diff --git a/tools/i18n/extract.php b/tools/i18n/extract.php
index 0e7fd30929..edd274fb46 100644
--- a/tools/i18n/extract.php
+++ b/tools/i18n/extract.php
@@ -10,10 +10,8 @@ require_once "$pomo/translations.php";
 class StringExtractor {
 
 	var $rules = array(
-		'_' => array( 'string' ),
 		'__' => array( 'string' ),
 		'_e' => array( 'string' ),
-		'_c' => array( 'string' ),
 		'_n' => array( 'singular', 'plural' ),
 	);
 	var $comment_prefix = 'translators:';