diff --git a/lib/autoloader.php b/lib/autoloader.php
index d7649781ea1491deb89a6891fbef50a1aa8a37fa..dd09c3b9cb56d03a72bcf664c5e3ab3035f69750 100644
--- a/lib/autoloader.php
+++ b/lib/autoloader.php
@@ -58,7 +58,7 @@ class Autoloader {
 	 * @param string $root
 	 */
 	public function addValidRoot($root) {
-		$this->validRoots[] = $root;
+		$this->validRoots[] = stream_resolve_include_path($root);
 	}
 
 	/**