diff --git a/awx/main/tasks.py b/awx/main/tasks.py
index 5804c9bb0b..5201d9ef6d 100644
--- a/awx/main/tasks.py
+++ b/awx/main/tasks.py
@@ -90,6 +90,7 @@ class RunJob(Task):
         env['REST_API_URL'] = settings.INTERNAL_API_URL
         env['REST_API_TOKEN'] = job.task_auth_token or ''
         env['ANSIBLE_NOCOLOR'] = '1' # Prevent output of escape sequences.
+        env['ANSIBLE_HOST_KEY_CHECKING'] = 'False'
         return env
 
     def build_args(self, job, **kwargs):