diff --git a/layouts/html.hbs b/layouts/html.hbs
index 3b6619164..cdf56fe7c 100644
--- a/layouts/html.hbs
+++ b/layouts/html.hbs
@@ -115,12 +115,11 @@
     <script>
       {{#babel}}
       function iframeGetSearchParams() {
-        let params = new URLSearchParams(window.location.search);
-        let verticalUrl = window.location.pathname.substr(1)
-        if (verticalUrl) {
-          params.set('verticalUrl', verticalUrl);
-        }
-        return params.toString();
+        const params = window.location.search.substr(1);
+        const verticalUrl = window.location.pathname.substr(1);
+        return verticalUrl 
+          ? params + '&verticalUrl=' + verticalUrl
+          : params;
       }
       let iframeLoadedResolve;
       window.iframeLoaded = new Promise(resolve => {
diff --git a/static/js/iframe-common.js b/static/js/iframe-common.js
index 6bf3ff8dc..dbaf4d408 100644
--- a/static/js/iframe-common.js
+++ b/static/js/iframe-common.js
@@ -15,9 +15,6 @@ export function generateIFrame(domain, queryParam, urlParam) {
     var paramString = window.location.search;
     paramString = paramString.substr(1, paramString.length);
 
-    // Decode ASCII forward slash to avod repeat encodings on page refreshes
-    paramString = paramString.replace("%2F", "/");
-
     // Parse the params out of the URL
     var params = paramString.split('&'),
                  verticalUrl;