diff --git a/plan9/env_unset.go b/plan9/env_unset.go
new file mode 100644
index 00000000..c37fc26e
--- /dev/null
+++ b/plan9/env_unset.go
@@ -0,0 +1,14 @@
+// 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 plan9
+
+import "syscall"
+
+func Unsetenv(key string) error {
+	// This was added in Go 1.4.
+	return syscall.Unsetenv(key)
+}
diff --git a/unix/env_unset.go b/unix/env_unset.go
new file mode 100644
index 00000000..92222625
--- /dev/null
+++ b/unix/env_unset.go
@@ -0,0 +1,14 @@
+// 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)
+}
diff --git a/windows/env_unset.go b/windows/env_unset.go
new file mode 100644
index 00000000..999ffac4
--- /dev/null
+++ b/windows/env_unset.go
@@ -0,0 +1,14 @@
+// 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 windows
+
+import "syscall"
+
+func Unsetenv(key string) error {
+	// This was added in Go 1.4.
+	return syscall.Unsetenv(key)
+}