diff --git a/chain/vm/syscalls.go b/chain/vm/syscalls.go
index 68dbbb2df..83a07ca2d 100644
--- a/chain/vm/syscalls.go
+++ b/chain/vm/syscalls.go
@@ -70,11 +70,6 @@ type syscallShim struct {
 }
 
 func (ss *syscallShim) ComputeUnsealedSectorCID(st abi.RegisteredSealProof, pieces []abi.PieceInfo) (cid.Cid, error) {
-	var sum abi.PaddedPieceSize
-	for _, p := range pieces {
-		sum += p.Size
-	}
-
 	commd, err := ffiwrapper.GenerateUnsealedCID(st, pieces)
 	if err != nil {
 		log.Errorf("generate data commitment failed: %s", err)
diff --git a/itests/deals_test.go b/itests/deals_test.go
index e8296ea87..a6953d07e 100644
--- a/itests/deals_test.go
+++ b/itests/deals_test.go
@@ -22,7 +22,7 @@ func TestDealsWithSealingAndRPC(t *testing.T) {
 	kit.QuietMiningLogs()
 
 	client, miner, ens := kit.EnsembleMinimal(t, kit.ThroughRPC(), kit.WithAllSubsystems()) // no mock proofs.
-	ens.InterconnectAll().BeginMining(250 * time.Millisecond)
+	ens.InterconnectAll().BeginMiningMustPost(250 * time.Millisecond)
 	dh := kit.NewDealHarness(t, client, miner, miner)
 
 	t.Run("stdretrieval", func(t *testing.T) {