diff --git a/src/ua-parser.js b/src/ua-parser.js
index f39a6d5..3e8ede1 100755
--- a/src/ua-parser.js
+++ b/src/ua-parser.js
@@ -1077,7 +1077,7 @@
     //   jQuery always exports to global scope, unless jQuery.noConflict(true) is used,
     //   and we should catch that.
     var $ = window && (window.jQuery || window.Zepto);
-    if (typeof $ !== UNDEF_TYPE) {
+    if (typeof $ !== UNDEF_TYPE && !$.ua) {
         var parser = new UAParser();
         $.ua = parser.getResult();
         $.ua.get = function () {