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diff --git a/vendor/symfony/http-kernel/Tests/HttpCache/HttpCacheTestCase.php b/vendor/symfony/http-kernel/Tests/HttpCache/HttpCacheTestCase.php
index ed5c690d6..b3aa2be2f 100644
--- a/vendor/symfony/http-kernel/Tests/HttpCache/HttpCacheTestCase.php
+++ b/vendor/symfony/http-kernel/Tests/HttpCache/HttpCacheTestCase.php
@@ -168,7 +168,7 @@ class HttpCacheTestCase extends TestCase
 
         $fp = opendir($directory);
         while (false !== $file = readdir($fp)) {
-            if (!in_array($file, array('.', '..'))) {
+            if (!\in_array($file, array('.', '..'))) {
                 if (is_link($directory.'/'.$file)) {
                     unlink($directory.'/'.$file);
                 } elseif (is_dir($directory.'/'.$file)) {