diff --git a/lib/livebook_web/components/form_components.ex b/lib/livebook_web/components/form_components.ex
index afa49cca9..e809eb32f 100644
--- a/lib/livebook_web/components/form_components.ex
+++ b/lib/livebook_web/components/form_components.ex
@@ -497,7 +497,8 @@ defmodule LivebookWeb.FormComponents do
           {@rest}
         >
           <option :if={@prompt} value="">{@prompt}</option>
-          {Phoenix.HTML.Form.options_for_select(@options, @value)}
+          <%!-- TODO: remove to_string/1 when fixed upstream, see https://github.com/phoenixframework/phoenix_html/issues/444#issuecomment-2713061480 --%>
+          {Phoenix.HTML.Form.options_for_select(@options, to_string(@value))}
         </select>
         <div class="pointer-events-none absolute inset-y-0 right-0 flex items-center px-2 text-gray-500">
           <.remix_icon icon="arrow-down-s-line" />