diff --git a/f8/app.cc b/f8/app.cc
index 3d377c4..b8b5b54 100644
--- a/f8/app.cc
+++ b/f8/app.cc
@@ -157,7 +157,8 @@ namespace f8
 
     const std::string App::NewGlobalUuid()
     {
-        return "";
+        std::string id = a8::Format("%d%d", {100 + zone_id_, uuid_->Generate()});
+        return id;
     }
 
     int App::GetPid()