diff --git a/scripts/upload_symbols.py b/scripts/upload_symbols.py
index 09e4adb..3cab249 100644
--- a/scripts/upload_symbols.py
+++ b/scripts/upload_symbols.py
@@ -394,7 +394,7 @@
       ExecRequest('put',
                   upload['uploadUrl'], timeout,
                   api_key=api_key,
-                  data=fp)
+                  data=fp.read())
     ExecRequest('post',
                 '%s/uploads/%s:complete' % (
                     upload_url, upload['uploadKey']),