diff --git a/server/controllers/authentication.js b/server/controllers/authentication.js
index 1fac7358..bfda4a88 100644
--- a/server/controllers/authentication.js
+++ b/server/controllers/authentication.js
@@ -170,7 +170,10 @@ async function authentication(fastify) {
     );
 
     fastify.post('/signout', async (_, reply) => {
-        reply.clearCookie(COOKIE_KEY_PUBLIC, { path: '/' }).clearCookie(COOKIE_KEY, { path: '/' });
+        reply.clearCookie(COOKIE_KEY_PUBLIC, { path: '/' });
+
+        // clear the http only cookie by setting an expired date
+        reply.setCookie(COOKIE_KEY, '', { path: '/', expires: new Date(0) });
 
         return {
             signout: 'ok',