diff --git a/unix/env_unix.go b/unix/env_unix.go
index 2e06b33f..706b3cd1 100644
--- a/unix/env_unix.go
+++ b/unix/env_unix.go
@@ -25,3 +25,7 @@ func Clearenv() {
 func Environ() []string {
 	return syscall.Environ()
 }
+
+func Unsetenv(key string) error {
+	return syscall.Unsetenv(key)
+}
diff --git a/unix/env_unset.go b/unix/env_unset.go
deleted file mode 100644
index c44fdc4a..00000000
--- a/unix/env_unset.go
+++ /dev/null
@@ -1,14 +0,0 @@
-// Copyright 2014 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.
-
-// +build go1.4
-
-package unix
-
-import "syscall"
-
-func Unsetenv(key string) error {
-	// This was added in Go 1.4.
-	return syscall.Unsetenv(key)
-}