diff --git a/extern/storage-sealing/input.go b/extern/storage-sealing/input.go
index 9654296ca..5d6176202 100644
--- a/extern/storage-sealing/input.go
+++ b/extern/storage-sealing/input.go
@@ -5,6 +5,8 @@ import (
 	"sort"
 	"time"
 
+	"github.com/filecoin-project/lotus/extern/storage-sealing/lib/nullreader"
+
 	"github.com/filecoin-project/go-padreader"
 	"github.com/filecoin-project/go-statemachine"
 	"github.com/ipfs/go-cid"
@@ -220,7 +222,7 @@ func (m *Sealing) handleAddPiece(ctx statemachine.Context, sector SectorInfo) er
 				m.minerSector(sector.SectorType, sector.SectorNumber),
 				pieceSizes,
 				p.Unpadded(),
-				NewNullReader(p.Unpadded()))
+				nullreader.NewNullReader(p.Unpadded()))
 			if err != nil {
 				err = xerrors.Errorf("writing padding piece: %w", err)
 				deal.accepted(sector.SectorNumber, offset, err)
diff --git a/extern/storage-sealing/lib/nullreader/nullreader.go b/extern/storage-sealing/lib/nullreader/nullreader.go
index dc3537ad7..9e4bc523c 100644
--- a/extern/storage-sealing/lib/nullreader/nullreader.go
+++ b/extern/storage-sealing/lib/nullreader/nullreader.go
@@ -1,5 +1,23 @@
 package nullreader
 
+import (
+	"io"
+
+	"github.com/filecoin-project/go-state-types/abi"
+)
+
+type NullReader struct {
+	*io.LimitedReader
+}
+
+func NewNullReader(size abi.UnpaddedPieceSize) io.Reader {
+	return &NullReader{(io.LimitReader(&Reader{}, int64(size))).(*io.LimitedReader)}
+}
+
+func (m NullReader) NullBytes() int64 {
+	return m.N
+}
+
 // TODO: extract this to someplace where it can be shared with lotus
 type Reader struct{}
 
diff --git a/extern/storage-sealing/nullreader.go b/extern/storage-sealing/nullreader.go
deleted file mode 100644
index 5987a4145..000000000
--- a/extern/storage-sealing/nullreader.go
+++ /dev/null
@@ -1,20 +0,0 @@
-package sealing
-
-import (
-	"io"
-
-	"github.com/filecoin-project/go-state-types/abi"
-	nr "github.com/filecoin-project/lotus/extern/storage-sealing/lib/nullreader"
-)
-
-type NullReader struct {
-	*io.LimitedReader
-}
-
-func NewNullReader(size abi.UnpaddedPieceSize) io.Reader {
-	return &NullReader{(io.LimitReader(&nr.Reader{}, int64(size))).(*io.LimitedReader)}
-}
-
-func (m NullReader) NullBytes() int64 {
-	return m.N
-}
diff --git a/extern/storage-sealing/states_sealing.go b/extern/storage-sealing/states_sealing.go
index 1b2556943..bc9389688 100644
--- a/extern/storage-sealing/states_sealing.go
+++ b/extern/storage-sealing/states_sealing.go
@@ -4,6 +4,8 @@ import (
 	"bytes"
 	"context"
 
+	"github.com/filecoin-project/lotus/extern/storage-sealing/lib/nullreader"
+
 	"github.com/ipfs/go-cid"
 	"golang.org/x/xerrors"
 
@@ -91,7 +93,7 @@ func (m *Sealing) padSector(ctx context.Context, sectorID storage.SectorRef, exi
 	for i, size := range sizes {
 		expectCid := zerocomm.ZeroPieceCommitment(size)
 
-		ppi, err := m.sealer.AddPiece(ctx, sectorID, existingPieceSizes, size, NewNullReader(size))
+		ppi, err := m.sealer.AddPiece(ctx, sectorID, existingPieceSizes, size, nullreader.NewNullReader(size))
 		if err != nil {
 			return nil, xerrors.Errorf("add piece: %w", err)
 		}
diff --git a/lib/rpcenc/reader.go b/lib/rpcenc/reader.go
index 61ae80ba9..1e00fb6be 100644
--- a/lib/rpcenc/reader.go
+++ b/lib/rpcenc/reader.go
@@ -15,13 +15,14 @@ import (
 	"sync"
 	"time"
 
+	sealing "github.com/filecoin-project/lotus/extern/storage-sealing/lib/nullreader"
+
 	"github.com/google/uuid"
 	logging "github.com/ipfs/go-log/v2"
 	"golang.org/x/xerrors"
 
 	"github.com/filecoin-project/go-jsonrpc"
 	"github.com/filecoin-project/go-state-types/abi"
-	sealing "github.com/filecoin-project/lotus/extern/storage-sealing"
 )
 
 var log = logging.Logger("rpcenc")
diff --git a/lib/rpcenc/reader_test.go b/lib/rpcenc/reader_test.go
index 302908df0..06171025a 100644
--- a/lib/rpcenc/reader_test.go
+++ b/lib/rpcenc/reader_test.go
@@ -9,12 +9,13 @@ import (
 	"strings"
 	"testing"
 
+	sealing "github.com/filecoin-project/lotus/extern/storage-sealing/lib/nullreader"
+
 	"github.com/gorilla/mux"
 	"github.com/stretchr/testify/require"
 	"golang.org/x/xerrors"
 
 	"github.com/filecoin-project/go-jsonrpc"
-	sealing "github.com/filecoin-project/lotus/extern/storage-sealing"
 )
 
 type ReaderHandler struct {