diff --git a/pkg/core/blockchain.go b/pkg/core/blockchain.go
index bfbdbba60..919606e79 100644
--- a/pkg/core/blockchain.go
+++ b/pkg/core/blockchain.go
@@ -1381,7 +1381,7 @@ func (bc *Blockchain) PoolTx(t *transaction.Transaction) error {
 		switch err {
 		case mempool.ErrOOM:
 			return ErrOOM
-		case mempool.ErrConflict:
+		case mempool.ErrDup:
 			return fmt.Errorf("mempool: %w", ErrAlreadyExists)
 		default:
 			return err