diff --git a/includes/common.inc b/includes/common.inc
index 0310514adbf33b5f1be203dc649a8bc2f828013a..7830e4015d04f7f7572933b024a83ab70e3fe34d 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -24,27 +24,6 @@
  */
 define('SAVED_DELETED', 3);
 
-/**
- * @name Title text filtering flags
- * @{
- * Flags for use in drupal_set_title().
- */
-
-/**
- * Flag for drupal_set_title(); text is not sanitized, so run check_plain().
- */
-define('CHECK_PLAIN', 0);
-
-/**
- * Flag for drupal_set_title(); text has already been sanitized.
- */
-define('PASS_THROUGH', -1);
-
-/**
- * @} End of "Title text filtering flags".
- */
-
-
 /**
  * Set content for a specified region.
  *