diff --git a/gs_cache/fake_omaha.py b/gs_cache/fake_omaha.py
index ea546c7..57ca934 100644
--- a/gs_cache/fake_omaha.py
+++ b/gs_cache/fake_omaha.py
@@ -30,7 +30,7 @@
   def POST(self, *args, **kwargs):
     """A URL handler to handle update check ping."""
     label = '/'.join(args)
-    full_update = kwargs.pop('full_update', 'unspecified')
+    full_update = kwargs.pop('full_payload', 'unspecified')
     server_addr, _ = cherrypy.request.headers.get('X-Forwarded-Host').split(':')
     body_length = int(cherrypy.request.headers.get('Content-Length', 0))
     data = cherrypy.request.rfile.read(body_length)