diff --git a/lib/ansible/modules/web_infrastructure/ansible_tower/tower_job_cancel.py b/lib/ansible/modules/web_infrastructure/ansible_tower/tower_job_cancel.py
index 635ae6624f..acbc92f906 100644
--- a/lib/ansible/modules/web_infrastructure/ansible_tower/tower_job_cancel.py
+++ b/lib/ansible/modules/web_infrastructure/ansible_tower/tower_job_cancel.py
@@ -31,6 +31,7 @@ options:
       description:
         - Fail loudly if the I(job_id) does not reference a running job.
       default: False
+      type: bool
 extends_documentation_fragment: tower
 '''