diff --git a/extern/storage-sealing/states_replica_update.go b/extern/storage-sealing/states_replica_update.go
index b2121ef72..caf50fb7e 100644
--- a/extern/storage-sealing/states_replica_update.go
+++ b/extern/storage-sealing/states_replica_update.go
@@ -31,15 +31,15 @@ func (m *Sealing) handleProveReplicaUpdate(ctx statemachine.Context, sector Sect
 		return xerrors.Errorf("invalid sector %d with nil CommR", sector.SectorNumber)
 	}
 
-	if err := checkPieces(ctx.Context(), m.maddr, sector, m.Api); err != nil { // Sanity check state
-		return handleErrors(ctx, err, sector)
-	}
-
 	vanillaProofs, err := m.sealer.ProveReplicaUpdate1(sector.sealingCtx(ctx.Context()), m.minerSector(sector.SectorType, sector.SectorNumber), *sector.CommR, *sector.UpdateSealed, *sector.UpdateUnsealed)
 	if err != nil {
 		return ctx.Send(SectorProveReplicaUpdateFailed{xerrors.Errorf("prove replica update (1) failed: %w", err)})
 	}
 
+	if err := checkPieces(ctx.Context(), m.maddr, sector, m.Api); err != nil { // Sanity check state
+		return handleErrors(ctx, err, sector)
+	}
+
 	proof, err := m.sealer.ProveReplicaUpdate2(sector.sealingCtx(ctx.Context()), m.minerSector(sector.SectorType, sector.SectorNumber), *sector.CommR, *sector.UpdateSealed, *sector.UpdateUnsealed, vanillaProofs)
 	if err != nil {
 		return ctx.Send(SectorProveReplicaUpdateFailed{xerrors.Errorf("prove replica update (2) failed: %w", err)})