diff --git a/evennia/server/amp.py b/evennia/server/amp.py
index 20b0a4ad6e..8c3998b0d2 100644
--- a/evennia/server/amp.py
+++ b/evennia/server/amp.py
@@ -322,7 +322,7 @@ class AMPProtocol(amp.AMP):
                                                    data=part,
                                                    ipart=ipart,
                                                    nparts=nparts)
-                        deferred.addErrback(self.errback, "%s part %i/%i" % (command.key, ipart, part))
+                        deferred.addErrback(self.errback, "%s part %i/%i" % (command.key, ipart, nparts))
                         deferreds.append(deferred)
                 self.lastsend = time() # don't use now here, keep it as up-to-date as possible
                 return deferreds