diff --git a/provisioning/tasks/install-site.yml b/provisioning/tasks/install-site.yml
index 9ddf99254..a5f1c1bc1 100644
--- a/provisioning/tasks/install-site.yml
+++ b/provisioning/tasks/install-site.yml
@@ -4,7 +4,7 @@
     {{ drush_path }} status bootstrap
     chdir={{ drupal_core_path }}
   register: drupal_site_installed
-  failed_when: false
+  failed_when: "drupal_site_installed.stdout is undefined"
   changed_when: false
   become: no