diff --git a/lib/sectorbuilder/sectorbuilder.go b/lib/sectorbuilder/sectorbuilder.go
index ee7e4aecb..3c11ffebd 100644
--- a/lib/sectorbuilder/sectorbuilder.go
+++ b/lib/sectorbuilder/sectorbuilder.go
@@ -17,6 +17,8 @@ type SectorSealingStatus = sectorbuilder.SectorSealingStatus
 
 type StagedSectorMetadata = sectorbuilder.StagedSectorMetadata
 
+type SortedSectorInfo = sectorbuilder.SortedSectorInfo
+
 const CommLen = sectorbuilder.CommitmentBytesLen
 
 type SectorBuilder struct {
@@ -81,7 +83,7 @@ func (sb *SectorBuilder) GetAllStagedSectors() ([]StagedSectorMetadata, error) {
 	return sectorbuilder.GetAllStagedSectors(sb.handle)
 }
 
-func (sb *SectorBuilder) GeneratePoSt(sectorInfo sectorbuilder.SortedSectorInfo, challengeSeed [CommLen]byte, faults []uint64) ([]byte, error) {
+func (sb *SectorBuilder) GeneratePoSt(sectorInfo SortedSectorInfo, challengeSeed [CommLen]byte, faults []uint64) ([]byte, error) {
 	// Wait, this is a blocking method with no way of interrupting it?
 	// does it checkpoint itself?
 	return sectorbuilder.GeneratePoSt(sb.handle, sectorInfo, challengeSeed, faults)
diff --git a/storage/miner.go b/storage/miner.go
index e17a1806f..2d3278c9f 100644
--- a/storage/miner.go
+++ b/storage/miner.go
@@ -265,7 +265,8 @@ func (m *Miner) maybeDoPost(ctx context.Context, ts *types.TipSet) (<-chan error
 
 	ret := make(chan error, 1)
 	go func() {
-		proof, err := m.secst.RunPoSt(ctx, sset, r)
+		var faults []uint64
+		proof, err := m.secst.RunPoSt(ctx, sset, r, faults)
 		if err != nil {
 			ret <- xerrors.Errorf("running post failed: %w", err)
 			return
diff --git a/storage/sector/store.go b/storage/sector/store.go
index cbad8917c..d83580a62 100644
--- a/storage/sector/store.go
+++ b/storage/sector/store.go
@@ -163,8 +163,8 @@ func (s *Store) WaitSeal(ctx context.Context, sector uint64) (sectorbuilder.Sect
 	return s.sb.SealStatus(sector)
 }
 
-func (s *Store) RunPoSt(ctx context.Context, sectors []*api.SectorInfo, r []byte) ([]byte, error) {
-	panic("NYI")
+func (s *Store) RunPoSt(ctx context.Context, sectors []*api.SectorInfo, r []byte, faults []uint64) ([]byte, error) {
+	panic("TODO")
 }
 
 func (s *Store) Stop() {