diff --git a/core/Tron.proto b/core/Tron.proto
index 834888e70..493b07bd0 100644
--- a/core/Tron.proto
+++ b/core/Tron.proto
@@ -618,6 +618,7 @@ message DelegatedResourceAccountIndex {
   bytes account = 1;
   repeated bytes fromAccounts = 2;
   repeated bytes toAccounts = 3;
+  int64 timestamp = 4;
 }
 
 message NodeInfo {