diff --git a/chain/actors/actor_storagemarket.go b/chain/actors/actor_storagemarket.go
index 2ae622a09..35da19350 100644
--- a/chain/actors/actor_storagemarket.go
+++ b/chain/actors/actor_storagemarket.go
@@ -8,6 +8,8 @@ import (
 	"github.com/libp2p/go-libp2p-core/peer"
 )
 
+const SectorSize = 1024
+
 func init() {
 	cbor.RegisterCborType(StorageMarketState{})
 	cbor.RegisterCborType(CreateStorageMinerParams{})
@@ -90,7 +92,7 @@ func (sma StorageMarketActor) CreateStorageMiner(act *types.Actor, vmctx types.V
 }
 
 func SupportedSectorSize(ssize types.BigInt) bool {
-	if ssize.Uint64() == 1024 {
+	if ssize.Uint64() == SectorSize {
 		return true
 	}
 	return false
diff --git a/chain/actors/actors_test.go b/chain/actors/actors_test.go
index bd12be01b..8a5fcabbc 100644
--- a/chain/actors/actors_test.go
+++ b/chain/actors/actors_test.go
@@ -103,7 +103,7 @@ func TestStorageMarketActorCreateMiner(t *testing.T) {
 
 	params := &StorageMinerConstructorParams{
 		Worker:     maddr,
-		SectorSize: types.NewInt(1024),
+		SectorSize: types.NewInt(SectorSize),
 		PeerID:     "fakepeerid",
 	}
 	enc, err := cbor.DumpObject(params)