diff --git a/plugins/tiddlywiki/browser-sniff/browser.js b/plugins/tiddlywiki/browser-sniff/browser.js
index 2ca0b4840..26989623a 100644
--- a/plugins/tiddlywiki/browser-sniff/browser.js
+++ b/plugins/tiddlywiki/browser-sniff/browser.js
@@ -42,8 +42,12 @@ exports.getInfoTiddlerFields = function() {
 				["is/sailfish","sailfish"],
 				["is/android","android"],
 				["is/windowsphone","windowsphone"],
-				["is/firefoxos","firefoxos"]
+				["is/firefoxos","firefoxos"],
+				["is/mobile","mobile"]
 			];
+		$tw.browser = $tw.utils.extend($tw.browser, {
+			is: bowser.browser,
+		});
 		$tw.utils.each(mappings,function(mapping) {
 			var value = bowser.browser[mapping[1]];
 			if(value === undefined) {