diff --git a/web/password_prompt.js b/web/password_prompt.js
index 4f99428f6..99315a36b 100644
--- a/web/password_prompt.js
+++ b/web/password_prompt.js
@@ -57,6 +57,7 @@ class PasswordPrompt {
     this.input.addEventListener("keydown", e => {
       if (e.keyCode === /* Enter = */ 13) {
         this.#verify();
+        e.preventDefault();
       }
     });