diff --git a/racket-webview-qt.rkt b/racket-webview-qt.rkt
index e8be56c..0421fb3 100644
--- a/racket-webview-qt.rkt
+++ b/racket-webview-qt.rkt
@@ -833,6 +833,7 @@
                         (handle (cdr kv)))
                     (rkt-webview-close handle)))
                 open-windows)))
+  (rkt_webview_register_evt_callback #f)
   (dbg-webview "Sending guard-stop message to event callback")
   ;(sleep 0.5)
   (event-callback evt-guard-stop)