diff --git a/dvrip.py b/dvrip.py
index 9eed5db..49eed3d 100644
--- a/dvrip.py
+++ b/dvrip.py
@@ -771,7 +771,7 @@ def upgrade(self, filename="", packetsize=0x8000, vprint=None):
         self.logger.debug("Starting upgrade...")
         while True:
             data, rcvd = self.recv_json(rcvd)
-            self.logger.debug(reply)
+            self.logger.debug(data)
             if data is None:
                 vprint("\nDone")
                 return