diff --git a/wallet/v1/msg.proto b/wallet/v1/msg.proto
index 99140f8..7aa4412 100644
--- a/wallet/v1/msg.proto
+++ b/wallet/v1/msg.proto
@@ -298,7 +298,7 @@ message Recipient {
 message InternalTransferAssetReq {
   auth.v1.InternalIAM iam = 1;
   Recipient recipient = 2;
-  string amount = 3;
+  double amount = 3;
   optional int64 network_id = 4;
   int64 asset_id = 5;
   optional bool approval = 6;
@@ -307,7 +307,7 @@ message InternalTransferAssetReq {
 
 message InternalTransferAssetRes {
   Recipient recipient = 1;
-  string amount = 2;
+  double amount = 2;
   string transaction_id = 3;
   string transaction_hash = 4;
 }
@@ -394,4 +394,4 @@ message GetPublicKeyByNationalIDReq {
 
 message GetPublicKeyByNationalIDRes {
   string pub_key = 1;
-}
\ No newline at end of file
+}