diff --git a/cmd/lotus-miner/init.go b/cmd/lotus-miner/init.go
index ce69fad5b..f0f84eb67 100644
--- a/cmd/lotus-miner/init.go
+++ b/cmd/lotus-miner/init.go
@@ -90,7 +90,6 @@ var initCmd = &cli.Command{
 		&cli.StringFlag{
 			Name:  "sector-size",
 			Usage: "specify sector size to use",
-			Value: units.BytesSize(float64(abi.SectorSize(2048))),
 		},
 		&cli.StringSliceFlag{
 			Name:  "pre-sealed-sectors",
@@ -129,11 +128,18 @@ var initCmd = &cli.Command{
 	Action: func(cctx *cli.Context) error {
 		log.Info("Initializing lotus miner")
 
-		sectorSizeInt, err := units.RAMInBytes(cctx.String("sector-size"))
+		ssize, err := abi.RegisteredSealProof_StackedDrg32GiBV1.SectorSize()
 		if err != nil {
-			return err
+			return xerrors.Errorf("failed to calculate default sector size: %w", err)
+		}
+
+		if cctx.IsSet("sector-size") {
+			sectorSizeInt, err := units.RAMInBytes(cctx.String("sector-size"))
+			if err != nil {
+				return err
+			}
+			ssize = abi.SectorSize(sectorSizeInt)
 		}
-		ssize := abi.SectorSize(sectorSizeInt)
 
 		gasPrice, err := types.BigFromString(cctx.String("gas-premium"))
 		if err != nil {
@@ -541,7 +547,7 @@ func storageMinerInit(ctx context.Context, cctx *cli.Context, api v1api.FullNode
 
 		addr = a
 	} else {
-		a, err := createStorageMiner(ctx, api, peerid, gasPrice, cctx)
+		a, err := createStorageMiner(ctx, api, ssize, peerid, gasPrice, cctx)
 		if err != nil {
 			return xerrors.Errorf("creating miner failed: %w", err)
 		}
@@ -621,7 +627,7 @@ func configureStorageMiner(ctx context.Context, api v1api.FullNode, addr address
 	return nil
 }
 
-func createStorageMiner(ctx context.Context, api v1api.FullNode, peerid peer.ID, gasPrice types.BigInt, cctx *cli.Context) (address.Address, error) {
+func createStorageMiner(ctx context.Context, api v1api.FullNode, ssize abi.SectorSize, peerid peer.ID, gasPrice types.BigInt, cctx *cli.Context) (address.Address, error) {
 	var err error
 	var owner address.Address
 	if cctx.String("owner") != "" {
@@ -633,11 +639,6 @@ func createStorageMiner(ctx context.Context, api v1api.FullNode, peerid peer.ID,
 		return address.Undef, err
 	}
 
-	ssize, err := units.RAMInBytes(cctx.String("sector-size"))
-	if err != nil {
-		return address.Undef, fmt.Errorf("failed to parse sector size: %w", err)
-	}
-
 	worker := owner
 	if cctx.String("worker") != "" {
 		worker, err = address.NewFromString(cctx.String("worker"))
@@ -712,7 +713,7 @@ func createStorageMiner(ctx context.Context, api v1api.FullNode, peerid peer.ID,
 	}
 
 	// Note: the correct thing to do would be to call SealProofTypeFromSectorSize if actors version is v3 or later, but this still works
-	spt, err := miner.WindowPoStProofTypeFromSectorSize(abi.SectorSize(ssize))
+	spt, err := miner.WindowPoStProofTypeFromSectorSize(ssize)
 	if err != nil {
 		return address.Undef, xerrors.Errorf("getting post proof type: %w", err)
 	}
diff --git a/documentation/en/cli-lotus-miner.md b/documentation/en/cli-lotus-miner.md
index 0e43e2e49..a10cb45ba 100644
--- a/documentation/en/cli-lotus-miner.md
+++ b/documentation/en/cli-lotus-miner.md
@@ -71,7 +71,7 @@ OPTIONS:
    --create-worker-key          create separate worker key (default: false)
    --worker value, -w value     worker key to use (overrides --create-worker-key)
    --owner value, -o value      owner key to use
-   --sector-size value          specify sector size to use (default: "2KiB")
+   --sector-size value          specify sector size to use
    --pre-sealed-sectors value   specify set of presealed sectors for starting as a genesis miner  (accepts multiple inputs)
    --pre-sealed-metadata value  specify the metadata file for the presealed sectors
    --nosync                     don't check full-node sync status (default: false)