diff --git a/Sources/BrowserServicesKit/ContentBlocking/UserScripts/contentblockerrules.js b/Sources/BrowserServicesKit/ContentBlocking/UserScripts/contentblockerrules.js
index 7ca771a6e..515ddbd2c 100644
--- a/Sources/BrowserServicesKit/ContentBlocking/UserScripts/contentblockerrules.js
+++ b/Sources/BrowserServicesKit/ContentBlocking/UserScripts/contentblockerrules.js
@@ -139,7 +139,7 @@
             // FROM: https://stackoverflow.com/a/7739035/73479
             // FIX: Better capturing of top level URL so that trackers in embedded documents are not considered first party
             if (window.location !== window.parent.location) {
-                return new URL(window.location.href !== 'about:blank' ? document.referrer : window.parent.location.href)
+                return new URL(window.location.href !== 'about:blank' ? document.referrer : window.parent.origin)
             } else {
                 return new URL(document.location.href)
             }