diff --git a/tests/Composer/Test/Repository/Vcs/GitHubDriverTest.php b/tests/Composer/Test/Repository/Vcs/GitHubDriverTest.php
index efafa0626..6ec9c25dc 100644
--- a/tests/Composer/Test/Repository/Vcs/GitHubDriverTest.php
+++ b/tests/Composer/Test/Repository/Vcs/GitHubDriverTest.php
@@ -261,6 +261,7 @@ class GitHubDriverTest extends TestCase
         // clean local clone if present
         $fs = new Filesystem();
         $fs->removeDirectory(sys_get_temp_dir() . '/composer-test');
+        $this->config->merge(['config' => ['cache-vcs-dir' => sys_get_temp_dir() . '/composer-test/cache']]);
 
         $process = $this->getProcessExecutorMock();
         $process->expects(array(