diff --git a/tools/releasetools/sign_target_files_apks.py b/tools/releasetools/sign_target_files_apks.py
index 3cf8ce711..e671cd559 100755
--- a/tools/releasetools/sign_target_files_apks.py
+++ b/tools/releasetools/sign_target_files_apks.py
@@ -102,6 +102,7 @@ import copy
 import errno
 import os
 import re
+import stat
 import subprocess
 import tempfile
 import zipfile