diff --git a/tools/google_play_upload.py b/tools/google_play_upload.py
index 9e3415e04fe9c325472b9d3f1d3ccb18b5dd2d7a..c3e3c4ecc4b28d4eb7ea01dc45dd26db4f030fb2 100755
--- a/tools/google_play_upload.py
+++ b/tools/google_play_upload.py
@@ -74,7 +74,7 @@ def main():
         track=release_track,
         packageName=package_name,
         body={u'releases': [{
-            u'versionCodes': apk_response['versionCode'],
+            u'versionCodes': [str(apk_response['versionCode'])],
             u'status': u'completed',
         }]}).execute()