diff --git a/src/sdk.js b/src/sdk.js
index 01528e6c3..f020ccd6f 100644
--- a/src/sdk.js
+++ b/src/sdk.js
@@ -99,11 +99,11 @@ class OpenForm {
     let pathname = this.useHashRouting ? '' : basePath || window.location.pathname;
 
     if (pathname.endsWith('/')) {
-      // ensure that the basename has no trailing slash (for react router)
+      // ensure that the pathname has no trailing slash (for react router)
       pathname = pathname.slice(0, pathname.length - 1);
     }
     this.routerBasePath = pathname;
-    this.basePath = this.useHashRouting ? window.location.pathname : pathname;
+    this.browserBasePath = this.useHashRouting ? window.location.pathname : pathname;
     this.makeRedirect();
     this.calculateClientBaseUrl();
   }
@@ -122,7 +122,7 @@ class OpenForm {
         action,
         actionParams
       );
-      const newUrl = new URL(this.routerBasePath, window.location.origin);
+      const newUrl = new URL(this.browserBasePath, window.location.origin);
       if (!this.useHashRouting) {
         newUrl.pathname += `${!newUrl.pathname.endsWith('/') ? '/' : ''}${redirectPath}`;
         // We first append query params from the redirect action
@@ -134,9 +134,6 @@ class OpenForm {
           newUrl.searchParams.append(key, val);
         }
       } else {
-        // We know newUrl.pathname === '/', as this.routerBasePath is '' with hash based routing
-        newUrl.pathname += window.location.pathname.slice(1);
-
         // First add extra unrelated query params, before hash (`#`)
         for (let [key, val] of query.entries()) {
           newUrl.searchParams.append(key, val);
@@ -156,7 +153,7 @@ class OpenForm {
   calculateClientBaseUrl() {
     // calculate the client-side base URL, as this is recorded in backend calls for
     // submissions.
-    const clientBase = resolvePath(this.basePath).pathname; // has leading slash
+    const clientBase = resolvePath(this.browserBasePath).pathname; // has leading slash
     this.clientBaseUrl = new URL(clientBase, window.location.origin).href;
   }