diff --git a/plugins/tiddlywiki/tiddlyweb/tiddlywebadaptor.js b/plugins/tiddlywiki/tiddlyweb/tiddlywebadaptor.js
index 7b5dc5af7..73c733502 100644
--- a/plugins/tiddlywiki/tiddlyweb/tiddlywebadaptor.js
+++ b/plugins/tiddlywiki/tiddlyweb/tiddlywebadaptor.js
@@ -311,7 +311,7 @@ TiddlyWebAdaptor.prototype.parseEtag = function(etag) {
 	}
 };
 
-if($tw.browser) {
+if($tw.browser && document.location.protocol.substr(0,4) === "http" ) {
 	exports.adaptorClass = TiddlyWebAdaptor;
 }