diff --git a/backend.php b/backend.php
index 9ed250cf5..3fa369397 100644
--- a/backend.php
+++ b/backend.php
@@ -499,6 +499,7 @@
 		break; // digestSend
 
 		case "loading":
+			header("Content-type: text/html");
 			print __("Loading, please wait...") . " " .
 				"<img src='images/indicator_tiny.gif'>";