diff --git a/app/rooms/[roomName]/PageClientImpl.tsx b/app/rooms/[roomName]/PageClientImpl.tsx
index 5f5b165..91967dd 100644
--- a/app/rooms/[roomName]/PageClientImpl.tsx
+++ b/app/rooms/[roomName]/PageClientImpl.tsx
@@ -50,8 +50,7 @@ export function PageClientImpl(props: {
 
   const handlePreJoinSubmit = React.useCallback(async (values: LocalUserChoices) => {
     setPreJoinChoices(values);
-    const url = new URL('/', window.location.origin);
-    url.pathname = CONN_DETAILS_ENDPOINT;
+    const url = new URL(CONN_DETAILS_ENDPOINT, window.location.origin);
     url.searchParams.append('roomName', props.roomName);
     url.searchParams.append('participantName', values.username);
     if (props.region) {