diff --git a/src/js/traffic.js b/src/js/traffic.js
index 56369c894..13627e2d1 100644
--- a/src/js/traffic.js
+++ b/src/js/traffic.js
@@ -911,7 +911,7 @@ var filterDocument = (function() {
             selectors: undefined,
             scriptlets: undefined,
             buffer: null,
-            mime: undefined,
+            mime: 'text/html',
             charset: undefined
         };