diff --git a/uptime.install b/uptime.install
index 723b672..f5ee78c 100644
--- a/uptime.install
+++ b/uptime.install
@@ -10,6 +10,8 @@
 function uptime_install() {
   $t = get_t();
   variable_set('uptime_ratio', $t('Error') . ' ');
+  // Enable the test submodule.
+  module_enable(array('uptime_widget_test'), 'FALSE');
   $text = $t('All pages now contain an uptime widget in the footer. !config_link and change the block settings at !blocks_link.', array(
     '!config_link' => l($t('Get an API key'), 'admin/config/system/uptime'),
     '!blocks_link' => l($t('Structure > Blocks > Uptime widget > Configure'), 'admin/structure/block/manage/uptime/uptime_widget/configure'),