diff --git a/app/assets/javascripts/discourse-common/addon/lib/get-url.js b/app/assets/javascripts/discourse-common/addon/lib/get-url.js
index 4a5a0f17150..fab9081c6fb 100644
--- a/app/assets/javascripts/discourse-common/addon/lib/get-url.js
+++ b/app/assets/javascripts/discourse-common/addon/lib/get-url.js
@@ -41,7 +41,7 @@ export function getURLWithCDN(url) {
 }
 
 export function getAbsoluteURL(path) {
-  return baseUrl + path;
+  return baseUrl + withoutPrefix(path);
 }
 
 export function isAbsoluteURL(url) {
diff --git a/app/assets/javascripts/discourse/tests/unit/lib/get-url-test.js b/app/assets/javascripts/discourse/tests/unit/lib/get-url-test.js
index 4f2a337c468..25553f9fe17 100644
--- a/app/assets/javascripts/discourse/tests/unit/lib/get-url-test.js
+++ b/app/assets/javascripts/discourse/tests/unit/lib/get-url-test.js
@@ -18,11 +18,20 @@ module("Unit | Utility | get-url", function () {
   });
 
   test("getAbsoluteURL", function (assert) {
-    setupURL(null, "https://example.com", "/forum");
+    setupURL(null, "https://example.com", null);
     assert.strictEqual(
       getAbsoluteURL("/cool/path"),
       "https://example.com/cool/path"
     );
+    setupURL(null, "https://example.com/forum", "/forum");
+    assert.strictEqual(
+      getAbsoluteURL("/cool/path"),
+      "https://example.com/forum/cool/path"
+    );
+    assert.strictEqual(
+      getAbsoluteURL("/forum/cool/path"),
+      "https://example.com/forum/cool/path"
+    );
   });
 
   test("withoutPrefix", function (assert) {