diff --git a/garbage.go b/garbage.go
index 47634eb5d..445ba8969 100644
--- a/garbage.go
+++ b/garbage.go
@@ -25,7 +25,7 @@ func (m *Sealing) pledgeSector(ctx context.Context, sectorID abi.SectorNumber, e
 
 	out := make([]Piece, len(sizes))
 	for i, size := range sizes {
-		ppi, err := m.sealer.AddPiece(ctx, size, sectorID, m.pledgeReader(size), existingPieceSizes)
+		ppi, err := m.sealer.AddPiece(ctx, sectorID, existingPieceSizes, size, m.pledgeReader(size))
 		if err != nil {
 			return nil, xerrors.Errorf("add piece: %w", err)
 		}
diff --git a/sealing.go b/sealing.go
index a7d11586a..a3652485e 100644
--- a/sealing.go
+++ b/sealing.go
@@ -116,7 +116,7 @@ func (m *Sealing) AllocatePiece(size abi.UnpaddedPieceSize) (sectorID abi.Sector
 func (m *Sealing) SealPiece(ctx context.Context, size abi.UnpaddedPieceSize, r io.Reader, sectorID abi.SectorNumber, dealID abi.DealID) error {
 	log.Infof("Seal piece for deal %d", dealID)
 
-	ppi, err := m.sealer.AddPiece(ctx, size, sectorID, r, []abi.UnpaddedPieceSize{})
+	ppi, err := m.sealer.AddPiece(ctx, sectorID, []abi.UnpaddedPieceSize{}, size, r)
 	if err != nil {
 		return xerrors.Errorf("adding piece to sector: %w", err)
 	}