diff --git a/lib/Schema.ts b/lib/Schema.ts
index c7a1330..33f0574 100644
--- a/lib/Schema.ts
+++ b/lib/Schema.ts
@@ -2,6 +2,6 @@
 export = ISchema;
 
 interface ISchema {
-    _id: boolean;
+    _id: boolean | any;
     [key:string]: any;
 }
\ No newline at end of file