diff --git a/unmount.go b/unmount.go
index 7acec46..0cc989d 100644
--- a/unmount.go
+++ b/unmount.go
@@ -1,23 +1,6 @@
-// Copyright 2015 Google Inc. All Rights Reserved.
-//
-// 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.
+package fuseshim
 
-package fuse
-
-import "github.com/jacobsa/fuse/internal/fuseshim"
-
-// Attempt to unmount the file system whose mount point is the supplied
-// directory.
+// Unmount tries to unmount the filesystem mounted at dir.
 func Unmount(dir string) error {
-	return fuseshim.Unmount(dir)
+	return unmount(dir)
 }
diff --git a/unmount_linux.go b/unmount_linux.go
new file mode 100644
index 0000000..6a165cc
--- /dev/null
+++ b/unmount_linux.go
@@ -0,0 +1,21 @@
+package fuseshim
+
+import (
+	"bytes"
+	"errors"
+	"os/exec"
+)
+
+func unmount(dir string) error {
+	cmd := exec.Command("fusermount", "-u", dir)
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		if len(output) > 0 {
+			output = bytes.TrimRight(output, "\n")
+			msg := err.Error() + ": " + string(output)
+			err = errors.New(msg)
+		}
+		return err
+	}
+	return nil
+}
diff --git a/unmount_std.go b/unmount_std.go
new file mode 100644
index 0000000..3c38dd2
--- /dev/null
+++ b/unmount_std.go
@@ -0,0 +1,17 @@
+// +build !linux
+
+package fuseshim
+
+import (
+	"os"
+	"syscall"
+)
+
+func unmount(dir string) error {
+	err := syscall.Unmount(dir, 0)
+	if err != nil {
+		err = &os.PathError{Op: "unmount", Path: dir, Err: err}
+		return err
+	}
+	return nil
+}