gistfile1.txt

diff --git a/mutagen/_util.py b/mutagen/_util.py
index 1332f9d..f331942 100644
--- a/mutagen/_util.py
+++ b/mutagen/_util.py
@@ -19,12 +19,7 @@ import errno
 import decimal
 from io import BytesIO
 
-try:
-    import mmap
-except ImportError:
-    # Google App Engine has no mmap:
-    #   https://github.com/quodlibet/mutagen/issues/286
-    mmap = None
+mmap = None
 
 from collections import namedtuple
 from contextlib import contextmanager