diff --git a/racket-webview.rkt b/racket-webview.rkt
index be70f36..3faace2 100644
--- a/racket-webview.rkt
+++ b/racket-webview.rkt
@@ -706,7 +706,7 @@
     'oke))
 
 (define/contract (webview-bind! wv selector event no-prevent-default)
-  (-> wv-win? (or/c symbol? string?) (or/c symbol? list-of-symbol?) list?)
+  (-> wv-win? (or/c symbol? string?) (or/c symbol? list-of-symbol?) boolean? list?)
   (let* ((sel (if (symbol? selector)
                   (format "#~a" selector)
                   selector))