diff --git a/awx/main/models/credential.py b/awx/main/models/credential.py
index ef74d91074..b6cf191b28 100644
--- a/awx/main/models/credential.py
+++ b/awx/main/models/credential.py
@@ -387,8 +387,8 @@ class CredentialType(CommonModelNameNotUnique):
     ENV_BLACKLIST = set((
         'VIRTUAL_ENV', 'PATH', 'PYTHONPATH', 'PROOT_TMP_DIR', 'JOB_ID',
         'INVENTORY_ID', 'INVENTORY_SOURCE_ID', 'INVENTORY_UPDATE_ID',
-        'AD_HOC_COMMAND_ID', 'REST_API_URL', 'REST_API_TOKEN', 'TOWER_HOST',
-        'AWX_HOST', 'MAX_EVENT_RES', 'CALLBACK_QUEUE', 'CALLBACK_CONNECTION', 'CACHE',
+        'AD_HOC_COMMAND_ID', 'REST_API_URL', 'REST_API_TOKEN', 'MAX_EVENT_RES',
+        'CALLBACK_QUEUE', 'CALLBACK_CONNECTION', 'CACHE',
         'JOB_CALLBACK_DEBUG', 'INVENTORY_HOSTVARS', 'FACT_QUEUE',
     ))
 
diff --git a/awx/main/tasks.py b/awx/main/tasks.py
index b403baff9a..e0432ae3cf 100644
--- a/awx/main/tasks.py
+++ b/awx/main/tasks.py
@@ -1039,8 +1039,6 @@ class RunJob(BaseTask):
             env['ANSIBLE_STDOUT_CALLBACK'] = 'awx_display'
             env['REST_API_URL'] = settings.INTERNAL_API_URL
             env['REST_API_TOKEN'] = job.task_auth_token or ''
-            env['TOWER_HOST'] = settings.TOWER_URL_BASE
-            env['AWX_HOST'] = settings.TOWER_URL_BASE
             env['CALLBACK_QUEUE'] = settings.CALLBACK_QUEUE
             env['CALLBACK_CONNECTION'] = settings.BROKER_URL
         env['CACHE'] = settings.CACHES['default']['LOCATION'] if 'LOCATION' in settings.CACHES['default'] else ''