diff --git a/extern/sector-storage/ffiwrapper/sealer_cgo.go b/extern/sector-storage/ffiwrapper/sealer_cgo.go
index a72f5a66f..c4e5511d1 100644
--- a/extern/sector-storage/ffiwrapper/sealer_cgo.go
+++ b/extern/sector-storage/ffiwrapper/sealer_cgo.go
@@ -371,7 +371,7 @@ func (sb *Sealer) ReadPiece(ctx context.Context, writer io.Writer, sector abi.Se
 	maxPieceSize := abi.PaddedPieceSize(sb.ssize)
 
 	pf, err := openPartialFile(maxPieceSize, path.Unsealed)
-	if xerrors.Is(err, os.ErrNotExist) {
+	if err != nil {
 		return false, xerrors.Errorf("opening partial file: %w", err)
 	}