diff --git a/examples/example-simple-chat/src/index.ts b/examples/example-simple-chat/src/index.ts
index 35d3990..6f86d27 100644
--- a/examples/example-simple-chat/src/index.ts
+++ b/examples/example-simple-chat/src/index.ts
@@ -94,7 +94,7 @@ function bootChat(ds: Ref) {
 function setWsurl() {
     const wsurl = document.getElementById('wsurl')! as HTMLInputElement;
     if (wsurl.value === '') {
-        wsurl.value = `ws://${document.location.host}:9001/`;
+        wsurl.value = `ws://${document.location.hostname}:9001/`;
     }
 }