diff --git a/reactive/kubernetes_worker.py b/reactive/kubernetes_worker.py
index c28aacd..46a822a 100644
--- a/reactive/kubernetes_worker.py
+++ b/reactive/kubernetes_worker.py
@@ -37,6 +37,7 @@
 from charms.reactive import is_state, is_flag_set, any_flags_set
 from charms.reactive import when, when_any, when_not, when_none
 from charms.reactive import data_changed, is_data_changed
+from charms.reactive import register_trigger
 
 from charmhelpers.core import hookenv, unitdata
 from charmhelpers.core.host import service_stop, service_restart
@@ -102,6 +103,11 @@
 db = unitdata.kv()
 
 
+register_trigger(
+    when="endpoint.azure.ready.changed", clear_flag="kubernetes-worker.cloud.ready"
+)
+
+
 @hook("upgrade-charm")
 def upgrade_charm():
     # migrate to new flags
@@ -1265,6 +1271,7 @@ def cloud_ready():
         write_gcp_snap_config("kubelet")
     elif is_state("endpoint.azure.ready"):
         write_azure_snap_config("kubelet")
+        clear_flag("endpoint.azure.ready.changed")
     set_state("kubernetes-worker.cloud.ready")
     set_state("kubernetes-worker.restart-needed")  # force restart
 
diff --git a/tox.ini b/tox.ini
index 410c35e..4586b8f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -44,3 +44,9 @@ deps =
 commands =
     flake8 {toxinidir}/reactive {toxinidir}/tests {toxinidir}/actions
     black --check {toxinidir}/reactive {toxinidir}/tests {toxinidir}/actions
+
+[testenv:format]
+deps =
+    black
+commands =
+    black {toxinidir}/reactive {toxinidir}/tests {toxinidir}/actions