diff --git a/sapper-dev-client.js b/sapper-dev-client.js
index d1b59e1..b717a25 100644
--- a/sapper-dev-client.js
+++ b/sapper-dev-client.js
@@ -11,7 +11,7 @@ function check() {
 export function connect(port) {
 	if (source || !window.EventSource) return;
 
-	source = new EventSource(`http://localhost:${port}/__sapper__`);
+	source = new EventSource(`http://${window.location.hostname}:${port}/__sapper__`);
 
 	window.source = source;