diff --git a/packages/arb-validator-core/go.mod b/packages/arb-validator-core/go.mod
index 112c1ce25f..528aa458fa 100644
--- a/packages/arb-validator-core/go.mod
+++ b/packages/arb-validator-core/go.mod
@@ -9,6 +9,7 @@ require (
 	github.com/gorilla/mux v1.7.4
 	github.com/offchainlabs/arbitrum/packages/arb-util v0.6.4
 	github.com/pkg/errors v0.9.1
+	github.com/status-im/keycard-go v0.0.0-20190316090335-8537d3370df4
 	golang.org/x/crypto v0.0.0-20200311171314-f7b00557c8c4
 	google.golang.org/protobuf v1.24.0
 )
diff --git a/packages/arb-validator-core/message/transactionBatch.go b/packages/arb-validator-core/message/transactionBatch.go
index 1e933d41bd..c85e6d4077 100644
--- a/packages/arb-validator-core/message/transactionBatch.go
+++ b/packages/arb-validator-core/message/transactionBatch.go
@@ -141,6 +141,7 @@ func (m TransactionBatch) getBatchTransactions() []BatchTx {
 			break
 		}
 		txes = append(txes, batch)
+		offset += batch.encodedLength()
 	}
 	return txes
 }