diff --git a/src/Symfony/Component/HttpFoundation/Tests/FileBagTest.php b/src/Symfony/Component/HttpFoundation/Tests/FileBagTest.php
index 5042506bc6..1f29d56bc0 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/FileBagTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/FileBagTest.php
@@ -129,6 +129,20 @@ class FileBagTest extends \PHPUnit_Framework_TestCase
 
     protected function createTempFile()
     {
-        return tempnam(sys_get_temp_dir(), 'FormTest');
+        return tempnam(sys_get_temp_dir().'/form_test', 'FormTest');
+    }
+
+    protected function setUp()
+    {
+        mkdir(sys_get_temp_dir().'/form_test', 0777, true);
+    }
+
+    protected function tearDown()
+    {
+        foreach (glob(sys_get_temp_dir().'/form_test/*') as $file) {
+            unlink($file);
+        }
+
+        rmdir(sys_get_temp_dir().'/form_test');
     }
 }