diff --git a/chain/gen/utils.go b/chain/gen/utils.go
index 773ef83ab..aaf31c09a 100644
--- a/chain/gen/utils.go
+++ b/chain/gen/utils.go
@@ -246,7 +246,7 @@ func SetupStorageMiners(ctx context.Context, cs *store.ChainStore, sroot cid.Cid
 		params := mustEnc(&actors.CreateStorageMinerParams{
 			Owner:      owner,
 			Worker:     worker,
-			SectorSize: 1024, // TODO: needs to come from preseals info
+			SectorSize: build.SectorSizes[0], // TODO: needs to come from preseals info
 			PeerID:     pid,
 		})
 
diff --git a/cmd/lotus-seed/main.go b/cmd/lotus-seed/main.go
index f17e11bf3..603a346b4 100644
--- a/cmd/lotus-seed/main.go
+++ b/cmd/lotus-seed/main.go
@@ -53,7 +53,7 @@ var preSealCmd = &cli.Command{
 		},
 		&cli.Uint64Flag{
 			Name:  "sector-size",
-			Value: 1024,
+			Value: build.SectorSizes[0],
 			Usage: "specify size of sectors to pre-seal",
 		},
 		&cli.StringFlag{