diff --git a/lib/firmware/flash_ap.py b/lib/firmware/flash_ap.py
index 24cc07e..142bc6b 100755
--- a/lib/firmware/flash_ap.py
+++ b/lib/firmware/flash_ap.py
@@ -169,7 +169,7 @@
   logging.info('connecting to: %s\n', ip)
   id_filename = '/mnt/host/source/chromite/ssh_keys/testing_rsa'
   tmpfile = tempfile.NamedTemporaryFile()
-  shutil.copy(id_filename, tmpfile.name)
+  shutil.copyfile(id_filename, tmpfile.name)
 
   scp_cmd, flash_cmd = _build_ssh_cmds(futility, ip, port, path, tmpfile.name,
                                        fast, verbose)