diff --git a/lib/hashtag.php b/lib/hashtag.php
index 4b50e7c..7b6b82f 100644
--- a/lib/hashtag.php
+++ b/lib/hashtag.php
@@ -1,7 +1,7 @@
 <?php
 
 function hashtag($str,$ucfirst=true) {
-	$str=preg_replace('#^\W*(.*)\W*$#','$1',$str);
+	$str=preg_replace('#^\W*(.*)\W*$#u','$1',$str);
 	$str=preg_split('#\W+#u',$str);
 	$c=count($str);
 	if ($c>1) {