Index: modules/filter/filter.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/filter/filter.admin.inc,v
retrieving revision 1.8.2.1
diff -u -p -r1.8.2.1 filter.admin.inc
--- modules/filter/filter.admin.inc	12 Feb 2008 14:25:34 -0000	1.8.2.1
+++ modules/filter/filter.admin.inc	24 Jul 2010 18:19:21 -0000
@@ -273,6 +273,7 @@ function filter_admin_delete_submit($for
   db_query("UPDATE {node_revisions} SET format = %d WHERE format = %d", $default, $form_state['values']['format']);
   db_query("UPDATE {comments} SET format = %d WHERE format = %d", $default, $form_state['values']['format']);
   db_query("UPDATE {boxes} SET format = %d WHERE format = %d", $default, $form_state['values']['format']);
+  db_query("UPDATE {users} SET signature_format = %d WHERE signature_format = %d", $default, $form_state['values']['format']);
 
   cache_clear_all($form_state['values']['format'] .':', 'cache_filter', TRUE);
   drupal_set_message(t('Deleted input format %format.', array('%format' => $form_state['values']['name'])));