diff --git a/cmd/lotus-seed/genesis.go b/cmd/lotus-seed/genesis.go
index 66de93888b5..a27cc0a2f7c 100644
--- a/cmd/lotus-seed/genesis.go
+++ b/cmd/lotus-seed/genesis.go
@@ -572,7 +572,7 @@ var genesisCarCmd = &cli.Command{
 		}
 		ofile := c.String("out")
 		jrnl := journal.NilJournal()
-		bstor := blockstore.NewMemorySync()
+		bstor := blockstore.WrapIDStore(blockstore.NewMemorySync())
 		sbldr := vm.Syscalls(ffiwrapper.ProofVerifier)
 		_, err := testing.MakeGenesis(ofile, c.Args().First())(bstor, sbldr, jrnl)()
 		return err