diff --git a/tasks/asserts.yml b/tasks/asserts.yml
index 9bc0b60..5193480 100644
--- a/tasks/asserts.yml
+++ b/tasks/asserts.yml
@@ -7,5 +7,10 @@
 - name: assert | check vars
   assert:
     that:
+      - pbs_user is defined
+      - pbs_password is defined
+      - pbs_server is defined
+      - pbs_datastore is defined
+      - pbs_fingerrprint is defined
       - backup_dir is defined
       - backup_local_retention is defined