diff --git a/pkg/component/controller/coredns.go b/pkg/component/controller/coredns.go
index c000ae2a24b3..a142b57d3b5f 100644
--- a/pkg/component/controller/coredns.go
+++ b/pkg/component/controller/coredns.go
@@ -226,7 +226,7 @@ metadata:
     k8s-app: kube-dns
     kubernetes.io/name: "CoreDNS"
 spec:
-  minAvailable: 50%
+  maxUnavailable: 1
   selector:
     matchLabels:
       k8s-app: kube-dns