diff --git a/mopidy/frontends/mpd/translator.py b/mopidy/frontends/mpd/translator.py
index e5a55960..e15e1ba5 100644
--- a/mopidy/frontends/mpd/translator.py
+++ b/mopidy/frontends/mpd/translator.py
@@ -141,6 +141,7 @@ def _add_to_tag_cache(result, folders, files):
         path = uri_to_path(track_result['file'])
         track_result['mtime'] = get_mtime(path)
         track_result['file'] = re.sub(regexp, '', path)
+        track_result['key'] = os.path.basename(track_result['file'])
         track_result = order_mpd_track_info(track_result.items())
         result.extend(track_result)
     result.append(('songList end',))
diff --git a/tests/frontends/mpd/serializer_test.py b/tests/frontends/mpd/serializer_test.py
index 6fe50657..77a25e15 100644
--- a/tests/frontends/mpd/serializer_test.py
+++ b/tests/frontends/mpd/serializer_test.py
@@ -101,6 +101,7 @@ class TracksToTagCacheFormatTest(unittest.TestCase):
         result = dict(translator.track_to_mpd_format(track))
         result['file'] = uri_to_path(result['file'])
         result['file'] = result['file'][len(folder)+1:]
+        result['key'] = os.path.basename(result['file'])
         result['mtime'] = mtime('')
         return translator.order_mpd_track_info(result.items())