diff --git a/Extractor/ApiDocExtractor.php b/Extractor/ApiDocExtractor.php
index 32de0d4..690d8d5 100644
--- a/Extractor/ApiDocExtractor.php
+++ b/Extractor/ApiDocExtractor.php
@@ -102,7 +102,7 @@ class ApiDocExtractor
         $resources = array();
 
         foreach ($routes as $route) {
-            if (!($route instanceof Route)) {
+            if (!$route instanceof Route) {
                 throw new \InvalidArgumentException(sprintf('All elements of $routes must be instances of Route. "%s" given', gettype($route)));
             }