diff --git a/roles/kubernetes/preinstall/tasks/verify-settings.yml b/roles/kubernetes/preinstall/tasks/verify-settings.yml
index 9a04e2016a015fce97694a290955a1ac0ae45656..c3609245be04568cbda23e44e109134da22d2795 100644
--- a/roles/kubernetes/preinstall/tasks/verify-settings.yml
+++ b/roles/kubernetes/preinstall/tasks/verify-settings.yml
@@ -30,7 +30,8 @@
 
 - name: "Stop if known booleans are set as strings (Use JSON format on CLI: -e \"{'key': true }\")"
   assert:
-    that: item|type_debug == 'bool'
+    that: hostvars[inventory_hostname][item]|type_debug == 'bool'
+    msg: "{{hostvars[inventory_hostname][item]}} isn't a bool"
   run_once: yes
   with_items:
     - kubeadm_enabled