diff --git a/index.php b/index.php
index ad5bb110..b89d9fc0 100644
--- a/index.php
+++ b/index.php
@@ -17,8 +17,7 @@
 namespace Aviat\AnimeClient;
 
 use function Aviat\AnimeClient\loadToml;
-
-use Aviat\AnimeClient\AnimeClient;
+use function Aviat\Ion\_dir;
 
 // Work around the silly timezone error
 $timezone = ini_get('date.timezone');
diff --git a/src/AnimeClient.php b/src/AnimeClient.php
index 849a0615..f1d07a15 100644
--- a/src/AnimeClient.php
+++ b/src/AnimeClient.php
@@ -28,18 +28,6 @@ const NOT_FOUND_METHOD = 'notFound';
 const ERROR_MESSAGE_METHOD = 'errorPage';
 const SRC_DIR = SRC_DIR;
 
-/**
- * Joins paths together. Variadic to take an
- * arbitrary number of arguments
- *
- * @param string[] ...$args
- * @return string
- */
-function _dir(...$args)
-{
-	return implode(DIRECTORY_SEPARATOR, $args);
-}
-
 /**
  * Load configuration options from .toml files
  *
diff --git a/src/Controller.php b/src/Controller.php
index 2886feb7..398011cb 100644
--- a/src/Controller.php
+++ b/src/Controller.php
@@ -18,7 +18,7 @@ namespace Aviat\AnimeClient;
 
 use const Aviat\AnimeClient\SESSION_SEGMENT;
 
-use function Aviat\AnimeClient\_dir;
+use function Aviat\Ion\_dir;
 
 use Aviat\AnimeClient\API\JsonAPI;
 use Aviat\Ion\Di\{ContainerAware, ContainerInterface};
diff --git a/src/ControllerTrait.php b/src/ControllerTrait.php
index fa44caaa..7f2f4310 100644
--- a/src/ControllerTrait.php
+++ b/src/ControllerTrait.php
@@ -18,7 +18,7 @@ namespace Aviat\AnimeClient;
 
 use const Aviat\AnimeClient\SESSION_SEGMENT;
 
-use function Aviat\AnimeClient\_dir;
+use function Aviat\Ion\_dir;
 
 use Aviat\AnimeClient\API\JsonAPI;
 use Aviat\Ion\Di\{ContainerAware, ContainerInterface};
diff --git a/src/Dispatcher.php b/src/Dispatcher.php
index 3f3dffd2..2e092c7d 100644
--- a/src/Dispatcher.php
+++ b/src/Dispatcher.php
@@ -24,7 +24,7 @@ use const Aviat\AnimeClient\{
 	SRC_DIR
 };
 
-use function Aviat\AnimeClient\_dir;
+use function Aviat\Ion\_dir;
 
 use Aviat\Ion\Di\ContainerInterface;
 use Aviat\Ion\Friend;
diff --git a/tests/AnimeClientTest.php b/tests/AnimeClientTest.php
deleted file mode 100644
index 6725c830..00000000
--- a/tests/AnimeClientTest.php
+++ /dev/null
@@ -1,29 +0,0 @@
-<?php declare(strict_types=1);
-/**
- * Hummingbird Anime List Client
- *
- * An API client for Kitsu and MyAnimeList to manage anime and manga watch lists
- *
- * PHP version 7
- *
- * @package     HummingbirdAnimeClient
- * @author      Timothy J. Warren <tim@timshomepage.net>
- * @copyright   2015 - 2017  Timothy J. Warren
- * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
- * @version     4.0
- * @link        https://git.timshomepage.net/timw4mail/HummingBirdAnimeClient
- */
-
-namespace Aviat\AnimeClient\Tests;
-
-use function Aviat\AnimeClient\_dir;
-
-class AnimeClientTest extends AnimeClientTestCase {
-	/**
-	 * Basic sanity test for _dir function
-	 */
-	public function testDir()
-	{
-		$this->assertEquals('foo' . \DIRECTORY_SEPARATOR . 'bar', _dir('foo', 'bar'));
-	}
-}
diff --git a/tests/AnimeClientTestCase.php b/tests/AnimeClientTestCase.php
index d6040b1d..f531273f 100644
--- a/tests/AnimeClientTestCase.php
+++ b/tests/AnimeClientTestCase.php
@@ -18,7 +18,7 @@ namespace Aviat\AnimeClient\Tests;
 
 use const Aviat\AnimeClient\SRC_DIR;
 
-use function Aviat\AnimeClient\_dir;
+use function Aviat\Ion\_dir;
 
 use Aura\Web\WebFactory;
 use Aviat\Ion\Json;