diff --git a/wallet/v1/msg.proto b/wallet/v1/msg.proto
index 6fffc36..323541a 100644
--- a/wallet/v1/msg.proto
+++ b/wallet/v1/msg.proto
@@ -74,7 +74,7 @@ message BalanceReq{
 message CheckBalanceReq{
   auth.v1.InternalIAM iam = 1;
   int64 asset_id = 2;
-  optional double amount = 3; // Checks if user have enough balance
+  double amount = 3; // Checks if user have enough balance
 }