diff --git a/tools/post_process_mac_perms b/tools/post_process_mac_perms
index 47f43a0cfb9e155c477e9c25200fadb2dc0fce7d..25893ed386bde6e7d525f48483d4fce3fbd48269 100755
--- a/tools/post_process_mac_perms
+++ b/tools/post_process_mac_perms
@@ -86,7 +86,7 @@ def add_leftover_certs(args):
 
     # Inline replace with new policy stanzas
     for line in fileinput.input(args.policy, inplace=True):
-      print line.replace('</policy>', mac_perms_string)
+      sys.stdout.write(line.replace('</policy>', mac_perms_string))
 
 def main(argv):
   parser = argparse.ArgumentParser(description=__doc__)