diff --git a/dev/TestRunner.php b/dev/TestRunner.php
index 786499de4..7b2b23aea 100755
--- a/dev/TestRunner.php
+++ b/dev/TestRunner.php
@@ -82,7 +82,7 @@ class TestRunner extends Controller {
 			BASE_PATH, true, isset($_GET['flush'])
 		);
 		
-		SS_ClassLoader::instance()->pushManifest($classManifest);
+		SS_ClassLoader::instance()->pushManifest($classManifest, false);
 		SapphireTest::set_test_class_manifest($classManifest);
 
 		SS_TemplateLoader::instance()->pushManifest(new SS_TemplateManifest(