diff --git a/tools/bzl/license-map.py b/tools/bzl/license-map.py
index 79aed37..1c8db72 100644
--- a/tools/bzl/license-map.py
+++ b/tools/bzl/license-map.py
@@ -6,8 +6,8 @@
 
 import argparse
 from collections import defaultdict
+from shutil import copyfileobj
 from sys import stdout, stderr
-import os
 import xml.etree.ElementTree as ET
 
 
@@ -113,8 +113,8 @@
   print()
   print("[[%s_license]]" % safename)
   print("----")
-  with open(n[2:].replace(":", "/"), "rb") as input:
-    os.write(stdout.fileno(), input.read(-1))
+  with open(n[2:].replace(":", "/")) as fd:
+    copyfileobj(fd, stdout)
   print()
   print("----")
   print()
diff --git a/tools/bzl/license.bzl b/tools/bzl/license.bzl
index 38dfbe5..3578173 100644
--- a/tools/bzl/license.bzl
+++ b/tools/bzl/license.bzl
@@ -25,7 +25,7 @@
   # post process the XML into our favorite format.
   native.genrule(
     name = "gen_license_txt_" + name,
-    cmd = "python $(location //tools/bzl:license-map.py) %s %s > $@" % (" ".join(opts), " ".join(xmls)),
+    cmd = "python2 $(location //tools/bzl:license-map.py) %s %s > $@" % (" ".join(opts), " ".join(xmls)),
     outs = [ name + ".txt" ],
     tools = tools,
     **kwargs