diff --git a/kubernetes/readiness/docker/init/ready.py b/kubernetes/readiness/docker/init/ready.py
index db7105a..3f76d10 100644
--- a/kubernetes/readiness/docker/init/ready.py
+++ b/kubernetes/readiness/docker/init/ready.py
@@ -79,7 +79,7 @@
         response = api.read_namespaced_deployment(deployment_name, namespace)
         s = response.status
         if (s.unavailable_replicas is None and
-                s.updated_replicas == response.spec.replicas and
+                ( s.updated_replicas is None or s.updated_replicas == response.spec.replicas ) and
                 s.replicas == response.spec.replicas and
                 s.ready_replicas == response.spec.replicas and
                 s.observed_generation == response.metadata.generation):