Index: search.php
===================================================================
--- search.php	(revision 8386)
+++ search.php	(working copy)
@@ -1034,7 +1034,7 @@
 }
 
 $template->assign_vars(array(
-	'S_SEARCH_ACTION'		=> "{$phpbb_root_path}search.$phpEx",
+	'S_SEARCH_ACTION'		=> append_sid("{$phpbb_root_path}search.$phpEx"),
 	'S_HIDDEN_FIELDS'		=> build_hidden_fields($s_hidden_fields),
 	'S_CHARACTER_OPTIONS'	=> $s_characters,
 	'S_FORUM_OPTIONS'		=> $s_forums,