diff --git a/tools/releasetools/ota_utils.py b/tools/releasetools/ota_utils.py
index ef1dca2..12acc13 100644
--- a/tools/releasetools/ota_utils.py
+++ b/tools/releasetools/ota_utils.py
@@ -16,6 +16,7 @@
 import itertools
 import logging
 import os
+import shutil
 import struct
 import zipfile
 
@@ -119,7 +120,7 @@
 
   # Re-sign the package after updating the metadata entry.
   if OPTIONS.no_signing:
-    output_file = prelim_signing
+    shutil.copy(prelim_signing, output_file)
   else:
     SignOutput(prelim_signing, output_file)