diff --git a/sleekxmpp/xmlstream/handler/callback.py b/sleekxmpp/xmlstream/handler/callback.py
index cfd3c43..f1fda80 100644
--- a/sleekxmpp/xmlstream/handler/callback.py
+++ b/sleekxmpp/xmlstream/handler/callback.py
@@ -84,3 +84,4 @@ class Callback(BaseHandler):
             self._pointer(payload)
             if self._once:
                 self._destroy = True
+                del self._pointer