diff --git a/iron-query-params.html b/iron-query-params.html
index 635f5d7..fe0e704 100644
--- a/iron-query-params.html
+++ b/iron-query-params.html
@@ -89,8 +89,14 @@
       for (var i = 0; i < paramList.length; i++) {
         var param = paramList[i].split('=');
         if (param[0]) {
-          params[decodeURIComponent(param[0])] =
-              decodeURIComponent(param[1] || '');
+          let key, value;
+          try {
+            key = param[0].replace(/%([^\d].)/, "%25$1");
+            value = param[1].replace(/%([^\d].)/, "%25$1");
+            params[decodeURIComponent(key)] = decodeURIComponent(value || '');
+          } catch (e) {
+            // console.log(e.message);
+          }
         }
       }
       return params;