diff --git a/pkg/apiserver/apiserver.go b/pkg/apiserver/apiserver.go
index 934aca0698d..cf4738941b7 100644
--- a/pkg/apiserver/apiserver.go
+++ b/pkg/apiserver/apiserver.go
@@ -238,7 +238,7 @@ func (g *APIGroupVersion) InstallREST(container *restful.Container, root string,
 }
 
 // TODO: Convert to go-restful
-func InstallValidator(mux Mux, servers map[string]Server) {
+func InstallValidator(mux Mux, servers func() map[string]Server) {
 	validator, err := NewValidator(servers)
 	if err != nil {
 		glog.Errorf("failed to set up validator: %v", err)
diff --git a/pkg/apiserver/validator.go b/pkg/apiserver/validator.go
index d8a918e6b38..bd8bb1e21e6 100644
--- a/pkg/apiserver/validator.go
+++ b/pkg/apiserver/validator.go
@@ -41,7 +41,7 @@ type Server struct {
 // validator is responsible for validating the cluster and serving
 type validator struct {
 	// a list of servers to health check
-	servers map[string]Server
+	servers func() map[string]Server
 	client  httpGet
 }
 
@@ -72,7 +72,7 @@ type ServerStatus struct {
 
 func (v *validator) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	reply := []ServerStatus{}
-	for name, server := range v.servers {
+	for name, server := range v.servers() {
 		status, msg, err := server.check(v.client)
 		var errorMsg string
 		if err != nil {
@@ -93,7 +93,7 @@ func (v *validator) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 // NewValidator creates a validator for a set of servers.
-func NewValidator(servers map[string]Server) (http.Handler, error) {
+func NewValidator(servers func() map[string]Server) (http.Handler, error) {
 	return &validator{
 		servers: servers,
 		client:  &http.Client{},
@@ -114,7 +114,7 @@ func makeTestValidator(servers map[string]string, get httpGet) (http.Handler, er
 		result[name] = Server{Addr: host, Port: val, Path: "/healthz"}
 	}
 
-	v, e := NewValidator(result)
+	v, e := NewValidator(func() map[string]Server { return result })
 	if e == nil {
 		v.(*validator).client = get
 	}
diff --git a/pkg/master/master.go b/pkg/master/master.go
index fce494f1821..568216ff596 100644
--- a/pkg/master/master.go
+++ b/pkg/master/master.go
@@ -339,8 +339,7 @@ func (m *Master) init(c *Config) {
 	apiserver.InstallSupport(m.handlerContainer, m.rootWebService)
 
 	// TODO: use go-restful
-	serversToValidate := m.getServersToValidate(c)
-	apiserver.InstallValidator(m.mux, serversToValidate)
+	apiserver.InstallValidator(m.mux, func() map[string]apiserver.Server { return m.getServersToValidate(c) })
 	if c.EnableLogsSupport {
 		apiserver.InstallLogsSupport(m.mux)
 	}
@@ -430,7 +429,7 @@ func (m *Master) getServersToValidate(c *Config) map[string]apiserver.Server {
 		glog.Errorf("Failed to list minions: %v", err)
 	}
 	for ix, node := range nodes.Items {
-		serversToValidate[fmt.Sprintf("node-%d", ix)] = apiserver.Server{Addr: node.Status.HostIP, Port: 10250, Path: "/healthz"}
+		serversToValidate[fmt.Sprintf("node-%d", ix)] = apiserver.Server{Addr: node.Name, Port: 10250, Path: "/healthz"}
 	}
 	return serversToValidate
 }