diff --git a/public/templates/header.tpl b/public/templates/header.tpl
index 56bfc48638..decbae43da 100644
--- a/public/templates/header.tpl
+++ b/public/templates/header.tpl
@@ -28,6 +28,7 @@
 	<script>
 		var RELATIVE_PATH = "{relative_path}";
 	</script>
+	<script src="{relative_path}/socket.io/socket.io.js"></script>
 	<!-- BEGIN clientScripts -->
 	<script src="{relative_path}/{clientScripts.script}?{cache-buster}"></script>
 	<!-- END clientScripts -->