diff --git a/src/yui/js/yui-ua.js b/src/yui/js/yui-ua.js
index 56adb2120b8..d2d9d2f6cf4 100644
--- a/src/yui/js/yui-ua.js
+++ b/src/yui/js/yui-ua.js
@@ -419,7 +419,7 @@ YUI.Env.parseUA = function(subUA) {
                         if (m && m[1]) {
                             o.gecko = numberify(m[1]);
                             if (/Mobile|Tablet/.test(ua)) {
-                                o.mobile = "gecko";
+                                o.mobile = "ffos";
                             }
                         }
                     }
diff --git a/src/yui/tests/unit/assets/ua-yui-data.js b/src/yui/tests/unit/assets/ua-yui-data.js
index 855f04e2deb..f6a9fb00306 100644
--- a/src/yui/tests/unit/assets/ua-yui-data.js
+++ b/src/yui/tests/unit/assets/ua-yui-data.js
@@ -575,7 +575,7 @@ Y.UAData["YUI Internal"] = [
                 "data": {
                         "gecko": 13,
                         "os": "android",
-                        "mobile": "gecko"
+                        "mobile": "ffos"
                 }
         },
         {
@@ -583,7 +583,7 @@ Y.UAData["YUI Internal"] = [
                 "data": {
                         "gecko": 13,
                         "os": "android",
-                        "mobile": "gecko"
+                        "mobile": "ffos"
                 }
         }
 ];