diff --git a/gn/standalone/write_ui_dist_file_map.py b/gn/standalone/write_ui_dist_file_map.py
index 8ea5aff..999bea5 100644
--- a/gn/standalone/write_ui_dist_file_map.py
+++ b/gn/standalone/write_ui_dist_file_map.py
@@ -30,7 +30,6 @@
 import argparse
 import base64
 import hashlib
-import multiprocessing
 import os
 import sys
 
@@ -60,15 +59,14 @@
   parser.add_argument('file_list', nargs=argparse.REMAINDER)
   args = parser.parse_args()
 
-  # Compute the hash of each file (in parallel).
-  pool = multiprocessing.Pool(multiprocessing.cpu_count() * 2)
-  digests = dict(pool.map(hash_file, args.file_list))
+  # Compute the hash of each file.
+  digests = dict(map(hash_file, args.file_list))
 
   contents = '// __generated_by %s\n' % __file__
   contents += 'export const UI_DIST_MAP = {\n'
   contents += '  files: {\n'
   strip = args.strip + ('' if args.strip[-1] == os.path.sep else os.path.sep)
-  for fname, digest in digests.iteritems():
+  for fname, digest in digests.items():
     if not fname.startswith(strip):
       raise Exception('%s must start with %s (--strip arg)' % (fname, strip))
     fname = fname[len(strip):]