diff --git a/tools/releasetools/sign_target_files_apks.py b/tools/releasetools/sign_target_files_apks.py
index 3cf8ce7..e671cd5 100755
--- a/tools/releasetools/sign_target_files_apks.py
+++ b/tools/releasetools/sign_target_files_apks.py
@@ -102,6 +102,7 @@
 import errno
 import os
 import re
+import stat
 import subprocess
 import tempfile
 import zipfile