diff --git a/xrm/xrm.d.ts b/xrm/xrm.d.ts
index ffdd2e1ae1..986ce7e78a 100644
--- a/xrm/xrm.d.ts
+++ b/xrm/xrm.d.ts
@@ -484,7 +484,7 @@ declare namespace Xrm
         /**
          * Called when the operation is successful.
          */
-        export type SuccessCallbackDelegate = ( object?: any ) => void;
+        export type SuccessCallbackDelegate = ( object: any ) => void;
 
         /**
          * Called when the operation fails.