diff --git a/services/web/server/src/simcore_service_webserver/projects/projects_api.py b/services/web/server/src/simcore_service_webserver/projects/projects_api.py
index 12b29ab8153..7126172be0b 100644
--- a/services/web/server/src/simcore_service_webserver/projects/projects_api.py
+++ b/services/web/server/src/simcore_service_webserver/projects/projects_api.py
@@ -216,7 +216,7 @@ async def get_project_for_user(
             )
         )
         project["accessRights"] = {
-            gid: access.model_dump()
+            f"{gid}": access.model_dump()
             for gid, access in workspace_db.access_rights.items()
         }