diff --git a/auth/v1/msg.proto b/auth/v1/msg.proto
index a481d74..e77c2c0 100644
--- a/auth/v1/msg.proto
+++ b/auth/v1/msg.proto
@@ -235,7 +235,7 @@ message CheckTFAReq {
 message TFA {
   TfaStateEnum state = 1;
   int64 code = 2;
-  int64 transaction_id = 3;
+  uint64 id = 3;
 }
 
 enum TfaStateEnum {