diff --git a/phpBB/search.php b/phpBB/search.php
index 929cf4116c..7f3464e8ad 100644
--- a/phpBB/search.php
+++ b/phpBB/search.php
@@ -1068,7 +1068,7 @@ if ($keywords || $author || $author_id || $search_id || $submit)
 				$u_mcp_queue = ($topic_unapproved || $posts_unapproved) ? append_sid("{$phpbb_root_path}mcp.$phpEx", 'i=queue&mode=' . (($topic_unapproved) ? 'approve_details' : 'unapproved_posts') . "&t=$result_topic_id", true, $user->session_id) : '';
 				$u_mcp_queue = (!$u_mcp_queue && $topic_deleted) ? append_sid("{$phpbb_root_path}mcp.$phpEx", "i=queue&mode=deleted_topics&t=$result_topic_id", true, $user->session_id) : $u_mcp_queue;
 
-				$row['topic_title'] = preg_replace('#(?!<.*)(?<!\w)(' . $hilit . ')(?!\w|[^<>]*(?:</s(?:cript|tyle))?>)#is', '<span class="posthilit">$1</span>', $row['topic_title']);
+				$row['topic_title'] = preg_replace('#(?!<.*)(?<!\w)(' . $hilit . ')(?!\w|[^<>]*(?:</s(?:cript|tyle))?>)#isu', '<span class="posthilit">$1</span>', $row['topic_title']);
 
 				$tpl_ary = array(
 					'TOPIC_AUTHOR'				=> get_username_string('username', $row['topic_poster'], $row['topic_first_poster_name'], $row['topic_first_poster_colour']),
@@ -1151,8 +1151,8 @@ if ($keywords || $author || $author_id || $search_id || $submit)
 				if ($hilit)
 				{
 					// post highlighting
-					$row['post_text'] = preg_replace('#(?!<.*)(?<!\w)(' . $hilit . ')(?!\w|[^<>]*(?:</s(?:cript|tyle))?>)#is', '<span class="posthilit">$1</span>', $row['post_text']);
-					$row['post_subject'] = preg_replace('#(?!<.*)(?<!\w)(' . $hilit . ')(?!\w|[^<>]*(?:</s(?:cript|tyle))?>)#is', '<span class="posthilit">$1</span>', $row['post_subject']);
+					$row['post_text'] = preg_replace('#(?!<.*)(?<!\w)(' . $hilit . ')(?!\w|[^<>]*(?:</s(?:cript|tyle))?>)#isu', '<span class="posthilit">$1</span>', $row['post_text']);
+					$row['post_subject'] = preg_replace('#(?!<.*)(?<!\w)(' . $hilit . ')(?!\w|[^<>]*(?:</s(?:cript|tyle))?>)#isu', '<span class="posthilit">$1</span>', $row['post_subject']);
 				}
 
 				$tpl_ary = array(