diff --git a/chains/lighter/message/lighter.go b/chains/lighter/message/lighter.go
index 83bf2b9b..96a4db99 100644
--- a/chains/lighter/message/lighter.go
+++ b/chains/lighter/message/lighter.go
@@ -155,7 +155,7 @@ func (h *LighterMessageHandler) calldata(tx *lighter.LighterTx, borrowAmount *bi
 	return consts.LighterABI.Pack(
 		"withdraw",
 		common.HexToHash(tx.Hash),
-		common.HexToAddress(tx.L1Address),
+		common.BytesToAddress(tx.Transfer.Memo[:20]),
 		borrowAmount)
 }
 
diff --git a/chains/lighter/message/lighter_test.go b/chains/lighter/message/lighter_test.go
index 98a82591..29e5461c 100644
--- a/chains/lighter/message/lighter_test.go
+++ b/chains/lighter/message/lighter_test.go
@@ -95,6 +95,7 @@ func (s *LighterMessageHandlerTestSuite) Test_HandleMessage_ValidMessage() {
 		Transfer: &lighter.Transfer{
 			USDCAmount:     2000000,
 			ToAccountIndex: 3,
+			Memo:           []byte{238, 123, 250, 212, 202, 237, 62, 98, 106, 248, 169, 199, 213, 3, 76, 213, 137, 238, 73, 144, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
 		},
 	}, nil)
 
@@ -137,6 +138,7 @@ func (s *LighterMessageHandlerTestSuite) Test_HandleMessage_InvalidTxType() {
 		Transfer: &lighter.Transfer{
 			USDCAmount:     2000000,
 			ToAccountIndex: 3,
+			Memo:           []byte{238, 123, 250, 212, 202, 237, 62, 98, 106, 248, 169, 199, 213, 3, 76, 213, 137, 238, 73, 144, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
 		},
 	}, nil)
 
@@ -179,6 +181,7 @@ func (s *LighterMessageHandlerTestSuite) Test_HandleMessage_InvalidAccount() {
 		Transfer: &lighter.Transfer{
 			USDCAmount:     2000000,
 			ToAccountIndex: 5,
+			Memo:           []byte{238, 123, 250, 212, 202, 237, 62, 98, 106, 248, 169, 199, 213, 3, 76, 213, 137, 238, 73, 144, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
 		},
 	}, nil)
 
@@ -258,6 +261,7 @@ func (s *LighterMessageHandlerTestSuite) Test_HandleMessage_BorrowAmountTooHigh(
 		Transfer: &lighter.Transfer{
 			USDCAmount:     2000000,
 			ToAccountIndex: 3,
+			Memo:           []byte{238, 123, 250, 212, 202, 237, 62, 98, 106, 248, 169, 199, 213, 3, 76, 213, 137, 238, 73, 144, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
 		},
 	}, nil)
 
diff --git a/protocol/lighter/api.go b/protocol/lighter/api.go
index 01a26ecf..8315ee84 100644
--- a/protocol/lighter/api.go
+++ b/protocol/lighter/api.go
@@ -24,6 +24,7 @@ type Transfer struct {
 	FromAccountIndex uint64
 	ToAccountIndex   int
 	Fee              uint64
+	Memo             []byte
 }
 
 type LighterTx struct {