diff --git a/etcdctl/ctlv2/command/util.go b/etcdctl/ctlv2/command/util.go
index 2f5c169d7..1bff41b6c 100644
--- a/etcdctl/ctlv2/command/util.go
+++ b/etcdctl/ctlv2/command/util.go
@@ -218,25 +218,9 @@ func mustNewClient(c *cli.Context) client.Client {
 				fmt.Fprintf(os.Stderr, "Try '--no-sync' if you want to access non-published client endpoints(%s).\n", strings.Join(hc.Endpoints(), ","))
 				handleError(ExitServerError, err)
 			}
-
 			if isConnectionError(err) {
 				handleError(ExitBadConnection, err)
 			}
-
-			// fail-back to try sync cluster with peer API. this is for making etcdctl work with etcd 0.4.x.
-			// TODO: remove this when we deprecate the support for etcd 0.4.
-			eps, serr := syncWithPeerAPI(c, ctx, hc.Endpoints())
-			if serr != nil {
-				if isConnectionError(serr) {
-					handleError(ExitBadConnection, serr)
-				} else {
-					handleError(ExitServerError, serr)
-				}
-			}
-			err = hc.SetEndpoints(eps)
-			if err != nil {
-				handleError(ExitServerError, err)
-			}
 		}
 		if debug {
 			fmt.Fprintf(os.Stderr, "got endpoints(%s) after sync\n", strings.Join(hc.Endpoints(), ","))
@@ -329,44 +313,3 @@ func newClient(c *cli.Context) (client.Client, error) {
 func contextWithTotalTimeout(c *cli.Context) (context.Context, context.CancelFunc) {
 	return context.WithTimeout(context.Background(), c.GlobalDuration("total-timeout"))
 }
-
-// syncWithPeerAPI syncs cluster with peer API defined at
-// https://github.com/coreos/etcd/blob/v0.4.9/server/server.go#L311.
-// This exists for backward compatibility with etcd 0.4.x.
-func syncWithPeerAPI(c *cli.Context, ctx context.Context, knownPeers []string) ([]string, error) {
-	tr, err := getTransport(c)
-	if err != nil {
-		return nil, err
-	}
-
-	var (
-		body []byte
-		resp *http.Response
-	)
-	for _, p := range knownPeers {
-		var req *http.Request
-		req, err = http.NewRequest("GET", p+"/v2/peers", nil)
-		if err != nil {
-			continue
-		}
-		resp, err = tr.RoundTrip(req)
-		if err != nil {
-			continue
-		}
-		if resp.StatusCode != http.StatusOK {
-			resp.Body.Close()
-			continue
-		}
-		body, err = ioutil.ReadAll(resp.Body)
-		resp.Body.Close()
-		if err == nil {
-			break
-		}
-	}
-	if err != nil {
-		return nil, err
-	}
-
-	// Parse the peers API format: https://github.com/coreos/etcd/blob/v0.4.9/server/server.go#L311
-	return strings.Split(string(body), ", "), nil
-}