diff --git a/Engine/Public/LCEngine.cs b/Engine/Public/LCEngine.cs
index 276797c..8abf27f 100644
--- a/Engine/Public/LCEngine.cs
+++ b/Engine/Public/LCEngine.cs
@@ -105,7 +105,8 @@ namespace LeanCloud.Engine {
 
             LCApplication.Initialize(Environment.GetEnvironmentVariable("LEANCLOUD_APP_ID"),
                 Environment.GetEnvironmentVariable("LEANCLOUD_APP_KEY"),
-                Environment.GetEnvironmentVariable("LEANCLOUD_API_SERVER"));
+                Environment.GetEnvironmentVariable("LEANCLOUD_API_SERVER"),
+                Environment.GetEnvironmentVariable("LEANCLOUD_APP_MASTER_KEY"));
             LCCore.HttpClient.AddAddtionalHeader(LCHookKeyName, Environment.GetEnvironmentVariable("LEANCLOUD_APP_HOOK_KEY"));
 
             Assembly assembly = Assembly.GetCallingAssembly();