diff --git a/cluster/addons/dns/kubedns-controller.yaml.sed b/cluster/addons/dns/kubedns-controller.yaml.sed
index c40874e20a4..1555c6eaee7 100644
--- a/cluster/addons/dns/kubedns-controller.yaml.sed
+++ b/cluster/addons/dns/kubedns-controller.yaml.sed
@@ -47,7 +47,7 @@ spec:
     spec:
       tolerations:
       - key: "CriticalAddonsOnly"
-        operator": "Exists"
+        operator: "Exists"
       volumes:
       - name: kube-dns-config
         configMap: