diff --git a/magnum_cluster_api/monitor.py b/magnum_cluster_api/monitor.py
index 9b19ab2e..75a77773 100644
--- a/magnum_cluster_api/monitor.py
+++ b/magnum_cluster_api/monitor.py
@@ -79,4 +79,4 @@ def poll_health_status(self):
 
         self.poll_nodegroup_replicas()
 
-        hacks.set_certificate_expiry_days(self.k8s_api)
+        hacks.set_certificate_expiry_days(k8s_api)