diff --git a/client/cancelreq.go b/client/cancelreq.go
index fefdb40e4..76d1f0401 100644
--- a/client/cancelreq.go
+++ b/client/cancelreq.go
@@ -4,8 +4,6 @@
 
 // borrowed from golang/net/context/ctxhttp/cancelreq.go
 
-// +build go1.5
-
 package client
 
 import "net/http"
diff --git a/client/cancelreq_go14.go b/client/cancelreq_go14.go
deleted file mode 100644
index 2bed38a41..000000000
--- a/client/cancelreq_go14.go
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// borrowed from golang/net/context/ctxhttp/cancelreq_go14.go
-
-// +build !go1.5
-
-package client
-
-import "net/http"
-
-func requestCanceler(tr CancelableTransport, req *http.Request) func() {
-	return func() {
-		tr.CancelRequest(req)
-	}
-}
diff --git a/client/fake_transport_go14_test.go b/client/fake_transport_go14_test.go
deleted file mode 100644
index 4a99a7d37..000000000
--- a/client/fake_transport_go14_test.go
+++ /dev/null
@@ -1,41 +0,0 @@
-// Copyright 2015 CoreOS, Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// +build !go1.5
-
-package client
-
-import (
-	"errors"
-	"net/http"
-)
-
-func (t *fakeTransport) RoundTrip(req *http.Request) (*http.Response, error) {
-	select {
-	case resp := <-t.respchan:
-		return resp, nil
-	case err := <-t.errchan:
-		return nil, err
-	case <-t.startCancel:
-		select {
-		// this simulates that the request is finished before cancel effects
-		case resp := <-t.respchan:
-			return resp, nil
-		// wait on finishCancel to simulate taking some amount of
-		// time while calling CancelRequest
-		case <-t.finishCancel:
-			return nil, errors.New("cancelled")
-		}
-	}
-}
diff --git a/client/fake_transport_test.go b/client/fake_transport_test.go
index 06761e266..7013a119f 100644
--- a/client/fake_transport_test.go
+++ b/client/fake_transport_test.go
@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build go1.5
-
 package client
 
 import (