diff --git a/go.mod b/go.mod
index e23a75ed7..3c687cd0f 100644
--- a/go.mod
+++ b/go.mod
@@ -44,7 +44,7 @@ require (
 	github.com/tmc/grpc-websocket-proxy v0.0.0-20170815181823-89b8d40f7ca8
 	github.com/ugorji/go v1.1.1
 	github.com/urfave/cli v1.18.0
-	github.com/xiang90/probing v0.0.0-20160813154853-07dd2e8dfe18
+	github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2
 	go.etcd.io/bbolt v1.3.1-etcd.7
 	go.uber.org/atomic v1.3.2 // indirect
 	go.uber.org/multierr v1.1.0 // indirect
diff --git a/go.sum b/go.sum
index 82bc802bf..58f4ddb54 100644
--- a/go.sum
+++ b/go.sum
@@ -90,8 +90,8 @@ github.com/ugorji/go v1.1.1 h1:gmervu+jDMvXTbcHQ0pd2wee85nEoE0BsVyEuzkfK8w=
 github.com/ugorji/go v1.1.1/go.mod h1:hnLbHMwcvSihnDhEfx2/BzKp2xb0Y+ErdfYcrs9tkJQ=
 github.com/urfave/cli v1.18.0 h1:m9MfmZWX7bwr9kUcs/Asr95j0IVXzGNNc+/5ku2m26Q=
 github.com/urfave/cli v1.18.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
-github.com/xiang90/probing v0.0.0-20160813154853-07dd2e8dfe18 h1:MPPkRncZLN9Kh4MEFmbnK4h3BD7AUmskWv2+EeZJCCs=
-github.com/xiang90/probing v0.0.0-20160813154853-07dd2e8dfe18/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
+github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 h1:eY9dn8+vbi4tKz5Qo6v2eYzo7kUS51QINcR5jNpbZS8=
+github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
 go.etcd.io/bbolt v1.3.1-etcd.7 h1:M0l89sIuZ+RkW0rLbUsmxescVzLwLUs+Kvks+0jeHdM=
 go.etcd.io/bbolt v1.3.1-etcd.7/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.uber.org/atomic v1.3.2 h1:2Oa65PReHzfn29GpvgsYwloV9AVFHPDk8tYxt2c2tr4=
diff --git a/vendor/github.com/xiang90/probing/prober.go b/vendor/github.com/xiang90/probing/prober.go
index c917cfd9d..9431c101e 100644
--- a/vendor/github.com/xiang90/probing/prober.go
+++ b/vendor/github.com/xiang90/probing/prober.go
@@ -3,6 +3,7 @@ package probing
 import (
 	"encoding/json"
 	"errors"
+	"fmt"
 	"net/http"
 	"sync"
 	"time"
@@ -60,6 +61,10 @@ func (p *prober) AddHTTP(id string, probingInterval time.Duration, endpoints []s
 					panic(err)
 				}
 				resp, err := p.tr.RoundTrip(req)
+				if err == nil && resp.StatusCode != http.StatusOK {
+					err = fmt.Errorf("got unexpected HTTP status code %s from %s", resp.Status, endpoints[pinned])
+					resp.Body.Close()
+				}
 				if err != nil {
 					s.recordFailure(err)
 					pinned = (pinned + 1) % len(endpoints)