diff --git a/apps/login/src/lib/service.ts b/apps/login/src/lib/service.ts
index e543f35467..aa212f8a1b 100644
--- a/apps/login/src/lib/service.ts
+++ b/apps/login/src/lib/service.ts
@@ -69,7 +69,7 @@ export function getServiceUrlFromHeaders(headers: ReadonlyHeaders): {
     if (host) {
       const [hostname, port] = host.split(":");
       if (hostname !== "localhost") {
-        instanceUrl = host;
+        instanceUrl = host.startsWith("https://") ? host : `https://${host}`;
       }
     }
   }