diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 39ac46c59f..a781ad5ddd 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -853,7 +853,7 @@ function smilies_pass($message)
 	usort($smilies, 'smiley_sort');
 	for($i = 0; $i < count($smilies); $i++)
 	{
-		$orig[] = "/(?<=.\\W|\\W.|^\\W)" . phpbb_preg_quote($smilies[$i]['code'], "/") . "(?=.\\W|\\W.|\\W$)/i";
+		$orig[] = "/(?<=.\\W|\\W.|^\\W)" . phpbb_preg_quote($smilies[$i]['code'], "/") . "(?=.\\W|\\W.|\\W$)/";
 		$repl[] = '<img src="'. $board_config['smilies_path'] . '/' . $smilies[$i]['smile_url'] . '" alt="' . $smilies[$i]['smile_url'] . '" border="0">';
 	}
 
@@ -1210,4 +1210,4 @@ function phpbb_preg_quote($str, $delimiter)
 	return $text;
 }
 
-?>
\ No newline at end of file
+?>