diff --git a/.changeset/eighty-apricots-kneel.md b/.changeset/eighty-apricots-kneel.md
new file mode 100644
index 0000000000..a9cabaf378
--- /dev/null
+++ b/.changeset/eighty-apricots-kneel.md
@@ -0,0 +1,5 @@
+---
+'@techdocs/cli': patch
+---
+
+Fix cookie endpoint mock for `serve`
diff --git a/packages/techdocs-cli/src/lib/httpServer.ts b/packages/techdocs-cli/src/lib/httpServer.ts
index 252004c7de..c38bc86d7a 100644
--- a/packages/techdocs-cli/src/lib/httpServer.ts
+++ b/packages/techdocs-cli/src/lib/httpServer.ts
@@ -62,7 +62,7 @@ export default class HTTPServer {
           // This endpoind is used by the frontend to issue a cookie for the user.
           // But the MkDocs server doesn't expose it as a the Backestage backend does.
           // So we need to fake it here to prevent 404 errors.
-          if (request.url === '/api/techdocs/cookie') {
+          if (request.url === '/api/techdocs/.backstage/auth/v1/cookie') {
             const oneHourInMilliseconds = 60 * 60 * 1000;
             const expiresAt = new Date(Date.now() + oneHourInMilliseconds);
             const cookie = { expiresAt: expiresAt.toISOString() };