diff --git a/build/flaws/broken-links.ts b/build/flaws/broken-links.ts
index 61ad773af1a7..30f53aff04a5 100644
--- a/build/flaws/broken-links.ts
+++ b/build/flaws/broken-links.ts
@@ -234,6 +234,7 @@ export function getBrokenLinksFlaws(
     } else if (
       href.startsWith("https://developer.mozilla.org/") &&
       !href.startsWith("https://developer.mozilla.org/en-US/curriculum/") &&
+      !href.startsWith("https://developer.mozilla.org/en-US/observatory") &&
       !href.startsWith("https://developer.mozilla.org/en-US/blog/")
     ) {
       // It might be a working 200 OK link but the link just shouldn't
@@ -285,7 +286,7 @@ export function getBrokenLinksFlaws(
     } else if (
       href.startsWith("/") &&
       !href.startsWith("//") &&
-      !/^\/(discord|en-US\/(blog|curriculum))(\/|$)/.test(href)
+      !/^\/(discord|en-US\/(blog|curriculum|observatory))(\/|$)/.test(href)
     ) {
       // Got to fake the domain to sensible extract the .search and .hash
       const absoluteURL = new URL(href, "http://www.example.com");
diff --git a/kumascript/macros/HTTPSidebar.ejs b/kumascript/macros/HTTPSidebar.ejs
index eaa828b301f9..1cc39f7575cf 100644
--- a/kumascript/macros/HTTPSidebar.ejs
+++ b/kumascript/macros/HTTPSidebar.ejs
@@ -326,7 +326,7 @@ var text = mdn.localStringMap({
                 <li><%-web.smartLink(`/${locale}/docs/Web/HTTP/Headers/X-Frame-Options`, null, "X-Frame-Options")%></li>
                 <li><%-web.smartLink(`/${locale}/docs/Web/HTTP/Headers/X-XSS-Protection`, null, "X-XSS-Protection")%></li>
                 <li><%-web.smartLink(`/${locale}/docs/Web/Security/Practical_implementation_guides`)%></li>
-                <li><a href="https://developer.mozilla.org/en-US/observatory">HTTP Observatory</a></li>
+                <li><a href="/en-US/observatory">HTTP Observatory</a></li>
             </ol>
         </details>
     </li>