diff --git a/states_sealing.go b/states_sealing.go
index 8043902d8..113105162 100644
--- a/states_sealing.go
+++ b/states_sealing.go
@@ -356,7 +356,7 @@ func (m *Sealing) handleCommitWait(ctx statemachine.Context, sector SectorInfo)
 func (m *Sealing) handleFinalizeSector(ctx statemachine.Context, sector SectorInfo) error {
 	// TODO: Maybe wait for some finality
 
-	if err := m.sealer.FinalizeSector(sector.sealingCtx(ctx.Context()), m.minerSector(sector.SectorNumber), sector.unsealedRanges(false)); err != nil {
+	if err := m.sealer.FinalizeSector(sector.sealingCtx(ctx.Context()), m.minerSector(sector.SectorNumber), sector.keepUnsealedRanges(false)); err != nil {
 		return ctx.Send(SectorFinalizeFailed{xerrors.Errorf("finalize sector: %w", err)})
 	}
 
@@ -367,7 +367,7 @@ func (m *Sealing) handleProvingSector(ctx statemachine.Context, sector SectorInf
 	// TODO: track sector health / expiration
 	log.Infof("Proving sector %d", sector.SectorNumber)
 
-	if err := m.sealer.ReleaseUnsealed(ctx.Context(), m.minerSector(sector.SectorNumber), sector.unsealedRanges(true)); err != nil {
+	if err := m.sealer.ReleaseUnsealed(ctx.Context(), m.minerSector(sector.SectorNumber), sector.keepUnsealedRanges(true)); err != nil {
 		log.Error(err)
 	}
 
diff --git a/types.go b/types.go
index 6c8bd38eb..255c93a55 100644
--- a/types.go
+++ b/types.go
@@ -142,7 +142,9 @@ func (t *SectorInfo) sealingCtx(ctx context.Context) context.Context {
 	return ctx
 }
 
-func (t *SectorInfo) unsealedRanges(invert bool) []storage.Range {
+// Returns list of offset/length tuples of sector data ranges which clients
+// requested to keep unsealed
+func (t *SectorInfo) keepUnsealedRanges(invert bool) []storage.Range {
 	var out []storage.Range
 
 	var at abi.UnpaddedPieceSize