diff --git a/tests/test_install.php b/tests/test_install.php
index 346cb1f0..47aaef6c 100644
--- a/tests/test_install.php
+++ b/tests/test_install.php
@@ -2,6 +2,7 @@
 
 require_once('lib/simpletest/autorun.php');
 require_once('lib/simpletest/unit_tester.php');
+require_once('lib/simpletest/web_tester.php');
 require_once('lib/simpletest/reporter.php');
 
 class ShimmieSimpleTestCase extends WebTestCase {