diff --git a/migrations/2016_02_04_095452_add_slug_to_discussions.php b/migrations/2016_02_04_095452_add_slug_to_discussions.php
index 21be8cc26..c34fdd17f 100644
--- a/migrations/2016_02_04_095452_add_slug_to_discussions.php
+++ b/migrations/2016_02_04_095452_add_slug_to_discussions.php
@@ -7,9 +7,9 @@
  * LICENSE file that was distributed with this source code.
  */
 
-use Flarum\Util\Str;
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Database\Schema\Builder;
+use Illuminate\Support\Str;
 
 return [
     'up' => function (Builder $schema) {
diff --git a/src/Discussion/Discussion.php b/src/Discussion/Discussion.php
index 9db74c4a7..5d2ecb6ed 100644
--- a/src/Discussion/Discussion.php
+++ b/src/Discussion/Discussion.php
@@ -23,7 +23,7 @@ use Flarum\Notification\Notification;
 use Flarum\Post\MergeableInterface;
 use Flarum\Post\Post;
 use Flarum\User\User;
-use Flarum\Util\Str;
+use Illuminate\Support\Str;
 
 /**
  * @property int $id
diff --git a/src/Util/Str.php b/src/Util/Str.php
deleted file mode 100644
index e00a6d70e..000000000
--- a/src/Util/Str.php
+++ /dev/null
@@ -1,31 +0,0 @@
-<?php
-
-/*
- * This file is part of Flarum.
- *
- * For detailed copyright and license information, please view the
- * LICENSE file that was distributed with this source code.
- */
-
-namespace Flarum\Util;
-
-class Str
-{
-    /**
-     * Create a slug out of the given string.
-     *
-     * Non-alphanumeric characters are converted to hyphens.
-     *
-     * @param string $str
-     * @return string
-     */
-    public static function slug($str)
-    {
-        $str = strtolower($str);
-        $str = preg_replace('/[^a-z0-9]/i', '-', $str);
-        $str = preg_replace('/-+/', '-', $str);
-        $str = preg_replace('/-$|^-/', '', $str);
-
-        return $str;
-    }
-}