diff --git a/chain/gen/gen.go b/chain/gen/gen.go
index f2c3832c1..d56f285a0 100644
--- a/chain/gen/gen.go
+++ b/chain/gen/gen.go
@@ -8,12 +8,11 @@ import (
 	"sync/atomic"
 	"time"
 
-	proof2 "github.com/filecoin-project/specs-actors/v2/actors/runtime/proof"
-
 	"github.com/filecoin-project/go-address"
 	"github.com/filecoin-project/go-state-types/abi"
 	"github.com/filecoin-project/go-state-types/big"
 	"github.com/filecoin-project/go-state-types/crypto"
+	"github.com/google/uuid"
 	block "github.com/ipfs/go-block-format"
 	"github.com/ipfs/go-blockservice"
 	"github.com/ipfs/go-cid"
@@ -25,6 +24,8 @@ import (
 	"go.opencensus.io/trace"
 	"golang.org/x/xerrors"
 
+	proof2 "github.com/filecoin-project/specs-actors/v2/actors/runtime/proof"
+
 	"github.com/filecoin-project/lotus/api"
 	"github.com/filecoin-project/lotus/build"
 	"github.com/filecoin-project/lotus/chain/actors/policy"
@@ -226,7 +227,7 @@ func NewGeneratorWithSectors(numSectors int) (*ChainGen, error) {
 		},
 		VerifregRootKey:  DefaultVerifregRootkeyActor,
 		RemainderAccount: DefaultRemainderAccountActor,
-		NetworkName:      "",
+		NetworkName:      uuid.New().String(),
 		Timestamp:        uint64(build.Clock.Now().Add(-500 * time.Duration(build.BlockDelaySecs) * time.Second).Unix()),
 	}