diff --git a/cloud/docker/docker.py b/cloud/docker/docker.py
index abb4e764aae..e77951abf49 100644
--- a/cloud/docker/docker.py
+++ b/cloud/docker/docker.py
@@ -164,8 +164,7 @@ options:
     description:
       - Username or UID to use within the container
     required: false
-    default:
-    aliases: []
+    default: null
     version_added: "2.0"
   username:
     description: