diff --git a/borg/archiver.py b/borg/archiver.py
index 07086709b..ecc44be76 100644
--- a/borg/archiver.py
+++ b/borg/archiver.py
@@ -34,6 +34,7 @@
 from .keymanager import KeyManager
 from .archive import backup_io, BackupOSError, Archive, ArchiveChecker, CHUNKER_PARAMS, is_special
 from .remote import RepositoryServer, RemoteRepository, cache_if_remote
+from .platform import umount
 
 has_lchflags = hasattr(os, 'lchflags')
 
@@ -539,6 +540,10 @@ def do_mount(self, args, repository, manifest, key):
                 self.exit_code = EXIT_ERROR
         return self.exit_code
 
+    def do_umount(self, args):
+        """un-mount the FUSE filesystem"""
+        return umount(args.mountpoint)
+
     @with_repository()
     def do_list(self, args, repository, manifest, key):
         """List archive or repository contents"""
@@ -1476,6 +1481,21 @@ def build_parser(self, args=None, prog=None):
         subparser.add_argument('-o', dest='options', type=str,
                                help='Extra mount options')
 
+        umount_epilog = textwrap.dedent("""
+        This command un-mounts a FUSE filesystem that was mounted with ``borg mount``.
+
+        This is a convenience wrapper that just calls the platform-specific shell
+        command - usually this is either umount or fusermount -u.
+        """)
+        subparser = subparsers.add_parser('umount', parents=[common_parser],
+                                          description=self.do_umount.__doc__,
+                                          epilog=umount_epilog,
+                                          formatter_class=argparse.RawDescriptionHelpFormatter,
+                                          help='umount repository')
+        subparser.set_defaults(func=self.do_umount)
+        subparser.add_argument('mountpoint', metavar='MOUNTPOINT', type=str,
+                               help='mountpoint of the filesystem to umount')
+
         info_epilog = textwrap.dedent("""
         This command displays some detailed information about the specified archive.
 
diff --git a/borg/helpers.py b/borg/helpers.py
index a4469c990..72129f08e 100644
--- a/borg/helpers.py
+++ b/borg/helpers.py
@@ -88,7 +88,7 @@ def check_extension_modules():
         raise ExtensionModuleError
     if crypto.API_VERSION != 2:
         raise ExtensionModuleError
-    if platform.API_VERSION != 2:
+    if platform.API_VERSION != 3:
         raise ExtensionModuleError
 
 
diff --git a/borg/platform.py b/borg/platform.py
index e1cffd87a..be7a2bcd1 100644
--- a/borg/platform.py
+++ b/borg/platform.py
@@ -1,5 +1,6 @@
 import errno
 import os
+import subprocess
 import sys
 
 
@@ -17,14 +18,19 @@ def sync_dir(path):
         os.close(fd)
 
 
+# most POSIX platforms (but not Linux), see also borg 1.1 platform.base
+def umount(mountpoint):
+    return subprocess.call(['umount', mountpoint])
+
+
 if sys.platform.startswith('linux'):  # pragma: linux only
-    from .platform_linux import acl_get, acl_set, API_VERSION
+    from .platform_linux import acl_get, acl_set, umount, API_VERSION
 elif sys.platform.startswith('freebsd'):  # pragma: freebsd only
     from .platform_freebsd import acl_get, acl_set, API_VERSION
 elif sys.platform == 'darwin':  # pragma: darwin only
     from .platform_darwin import acl_get, acl_set, API_VERSION
 else:  # pragma: unknown platform only
-    API_VERSION = 2
+    API_VERSION = 3
 
     def acl_get(path, item, st, numeric_owner=False):
         pass
diff --git a/borg/platform_darwin.pyx b/borg/platform_darwin.pyx
index edb41f715..4dc25b83a 100644
--- a/borg/platform_darwin.pyx
+++ b/borg/platform_darwin.pyx
@@ -1,7 +1,7 @@
 import os
 from .helpers import user2uid, group2gid, safe_decode, safe_encode
 
-API_VERSION = 2
+API_VERSION = 3
 
 cdef extern from "sys/acl.h":
     ctypedef struct _acl_t:
diff --git a/borg/platform_freebsd.pyx b/borg/platform_freebsd.pyx
index 27d636263..ae69af68a 100644
--- a/borg/platform_freebsd.pyx
+++ b/borg/platform_freebsd.pyx
@@ -1,7 +1,7 @@
 import os
 from .helpers import posix_acl_use_stored_uid_gid, safe_encode, safe_decode
 
-API_VERSION = 2
+API_VERSION = 3
 
 cdef extern from "errno.h":
     int errno
diff --git a/borg/platform_linux.pyx b/borg/platform_linux.pyx
index f9ed42415..0185268c1 100644
--- a/borg/platform_linux.pyx
+++ b/borg/platform_linux.pyx
@@ -1,9 +1,10 @@
 import os
 import re
+import subprocess
 from stat import S_ISLNK
 from .helpers import posix_acl_use_stored_uid_gid, user2uid, group2gid, safe_decode, safe_encode
 
-API_VERSION = 2
+API_VERSION = 3
 
 cdef extern from "sys/types.h":
     int ACL_TYPE_ACCESS
@@ -141,3 +142,7 @@ def acl_set(path, item, numeric_owner=False):
                 acl_set_file(p, ACL_TYPE_DEFAULT, default_acl)
         finally:
             acl_free(default_acl)
+
+
+def umount(mountpoint):
+    return subprocess.call(['fusermount', '-u', mountpoint])
diff --git a/borg/testsuite/__init__.py b/borg/testsuite/__init__.py
index 42b935d1e..8d757d2bd 100644
--- a/borg/testsuite/__init__.py
+++ b/borg/testsuite/__init__.py
@@ -9,6 +9,7 @@
 import unittest
 from ..xattr import get_all
 from ..logger import setup_logging
+from ..platform import umount
 
 try:
     import llfuse
@@ -110,11 +111,7 @@ def fuse_mount(self, location, mountpoint, *options):
         self.cmd(*args, fork=True)
         self.wait_for_mount(mountpoint)
         yield
-        if sys.platform.startswith('linux'):
-            cmd = 'fusermount -u %s' % mountpoint
-        else:
-            cmd = 'umount %s' % mountpoint
-        os.system(cmd)
+        umount(mountpoint)
         os.rmdir(mountpoint)
         # Give the daemon some time to exit
         time.sleep(.2)
diff --git a/docs/usage.rst b/docs/usage.rst
index 8743f6ac0..2a3538b22 100644
--- a/docs/usage.rst
+++ b/docs/usage.rst
@@ -545,6 +545,8 @@ Examples
 
 .. include:: usage/mount.rst.inc
 
+.. include:: usage/umount.rst.inc
+
 Examples
 ~~~~~~~~
 ::
@@ -552,7 +554,7 @@ Examples
     $ borg mount /path/to/repo::root-2016-02-15 /tmp/mymountpoint
     $ ls /tmp/mymountpoint
     bin  boot  etc	home  lib  lib64  lost+found  media  mnt  opt  root  sbin  srv  tmp  usr  var
-    $ fusermount -u /tmp/mymountpoint
+    $ borg umount /tmp/mymountpoint
 
 
 .. include:: usage/key_export.rst.inc
diff --git a/docs/usage/umount.rst.inc b/docs/usage/umount.rst.inc
new file mode 100644
index 000000000..febacda06
--- /dev/null
+++ b/docs/usage/umount.rst.inc
@@ -0,0 +1,40 @@
+.. IMPORTANT: this file is auto-generated from borg's built-in help, do not edit!
+
+.. _borg_umount:
+
+borg umount
+-----------
+::
+
+    usage: borg umount [-h] [--critical] [--error] [--warning] [--info] [--debug]
+                       [--lock-wait N] [--show-rc] [--no-files-cache] [--umask M]
+                       [--remote-path PATH]
+                       MOUNTPOINT
+    
+    un-mount the FUSE filesystem
+    
+    positional arguments:
+      MOUNTPOINT            mountpoint of the filesystem to umount
+    
+    optional arguments:
+      -h, --help            show this help message and exit
+      --critical            work on log level CRITICAL
+      --error               work on log level ERROR
+      --warning             work on log level WARNING (default)
+      --info, -v, --verbose
+                            work on log level INFO
+      --debug               work on log level DEBUG
+      --lock-wait N         wait for the lock, but max. N seconds (default: 1).
+      --show-rc             show/log the return code (rc)
+      --no-files-cache      do not load/update the file metadata cache used to
+                            detect unchanged files
+      --umask M             set umask to M (local and remote, default: 0077)
+      --remote-path PATH    set remote path to executable (default: "borg")
+    
+Description
+~~~~~~~~~~~
+
+This command un-mounts a FUSE filesystem that was mounted with ``borg mount``.
+
+This is a convenience wrapper that just calls the platform-specific shell
+command - usually this is either umount or fusermount -u.