diff --git a/tests/codeigniter/helpers/directory_helper_test.php b/tests/codeigniter/helpers/directory_helper_test.php
index d860473..de72dee 100644
--- a/tests/codeigniter/helpers/directory_helper_test.php
+++ b/tests/codeigniter/helpers/directory_helper_test.php
@@ -28,8 +28,8 @@
 
 		vfsStream::create($structure, $this->_test_dir);
 
-		// opendir() seems to fail on Windows + vfsStream when there are trailing slashes in directory names
-		if ( ! @opendir(vfsStream::url('testDir')))
+		// is_dir(), opendir(), etc. seem to fail on Windows + vfsStream when there are trailing backslashes in directory names
+		if ( ! is_dir(vfsStream::url('testDir').DIRECTORY_SEPARATOR))
 		{
 			$this->markTestSkipped();
 			return;