diff --git a/cmd/tomo/main.go b/cmd/tomo/main.go
index 60442de7e6..1faa8e331a 100644
--- a/cmd/tomo/main.go
+++ b/cmd/tomo/main.go
@@ -29,8 +29,8 @@ import (
 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/consensus/clique"
 	"github.com/ethereum/go-ethereum/console"
+	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/ethclient"
 	"github.com/ethereum/go-ethereum/internal/debug"
@@ -316,42 +316,39 @@ func startNode(ctx *cli.Context, stack *node.Node) {
 				started = true
 				log.Info("Enabled mining node!!!")
 			}
-			defer close(clique.Checkpoint)
+			defer close(core.Checkpoint)
 
-			for {
-				select {
-				case _ = <-clique.Checkpoint:
-					log.Info("Checkpoint!!! It's time to reconcile node's state...")
-					ok, err := ethereum.ValidateMiner()
-					if err != nil {
-						utils.Fatalf("Can't verify validator permission: %v", err)
+			for range core.Checkpoint {
+				log.Info("Checkpoint!!! It's time to reconcile node's state...")
+				ok, err := ethereum.ValidateMiner()
+				if err != nil {
+					utils.Fatalf("Can't verify validator permission: %v", err)
+				}
+				if !ok {
+					log.Info("Only validator can mine blocks. Cancelling mining on this node...")
+					if started {
+						ethereum.StopMining()
+						started = false
 					}
-					if !ok {
-						log.Info("Only validator can mine blocks. Cancelling mining on this node...")
-						if started {
-							ethereum.StopMining()
-							started = false
+					log.Info("Cancelled mining mode!!!")
+				} else if !started {
+					log.Info("Validator found. Enabling mining mode...")
+					// Use a reduced number of threads if requested
+					if threads := ctx.GlobalInt(utils.MinerThreadsFlag.Name); threads > 0 {
+						type threaded interface {
+							SetThreads(threads int)
 						}
-						log.Info("Cancelled mining mode!!!")
-					} else if !started {
-						log.Info("Validator found. Enabling mining mode...")
-						// Use a reduced number of threads if requested
-						if threads := ctx.GlobalInt(utils.MinerThreadsFlag.Name); threads > 0 {
-							type threaded interface {
-								SetThreads(threads int)
-							}
-							if th, ok := ethereum.Engine().(threaded); ok {
-								th.SetThreads(threads)
-							}
+						if th, ok := ethereum.Engine().(threaded); ok {
+							th.SetThreads(threads)
 						}
-						// Set the gas price to the limits from the CLI and start mining
-						ethereum.TxPool().SetGasPrice(utils.GlobalBig(ctx, utils.GasPriceFlag.Name))
-						if err := ethereum.StartMining(true); err != nil {
-							utils.Fatalf("Failed to start mining: %v", err)
-						}
-						started = true
-						log.Info("Enabled mining node!!!")
 					}
+					// Set the gas price to the limits from the CLI and start mining
+					ethereum.TxPool().SetGasPrice(utils.GlobalBig(ctx, utils.GasPriceFlag.Name))
+					if err := ethereum.StartMining(true); err != nil {
+						utils.Fatalf("Failed to start mining: %v", err)
+					}
+					started = true
+					log.Info("Enabled mining node!!!")
 				}
 			}
 		}()
diff --git a/consensus/clique/clique.go b/consensus/clique/clique.go
index 60c0ec4b1d..13e8bb878e 100644
--- a/consensus/clique/clique.go
+++ b/consensus/clique/clique.go
@@ -65,7 +65,6 @@ var (
 
 	diffInTurn = big.NewInt(2) // Block difficulty for in-turn signatures
 	diffNoTurn = big.NewInt(1) // Block difficulty for out-of-turn signatures
-	Checkpoint chan int
 )
 
 // Various error messages to mark blocks invalid. These should be private to
@@ -217,7 +216,6 @@ func New(config *params.CliqueConfig, db ethdb.Database) *Clique {
 	if conf.Epoch == 0 {
 		conf.Epoch = epochLength
 	}
-	Checkpoint = make(chan int)
 	// Allocate the snapshot caches and create the engine
 	recents, _ := lru.NewARC(inmemorySnapshots)
 	signatures, _ := lru.NewARC(inmemorySignatures)
diff --git a/core/blockchain.go b/core/blockchain.go
index ba13c23192..64f20b5840 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -30,7 +30,6 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/mclock"
 	"github.com/ethereum/go-ethereum/consensus"
-	"github.com/ethereum/go-ethereum/consensus/clique"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
@@ -48,8 +47,8 @@ import (
 
 var (
 	blockInsertTimer = metrics.NewRegisteredTimer("chain/inserts", nil)
-
-	ErrNoGenesis = errors.New("Genesis not found in chain")
+	Checkpoint       = make(chan int)
+	ErrNoGenesis     = errors.New("Genesis not found in chain")
 )
 
 const (
@@ -1188,7 +1187,7 @@ func (bc *BlockChain) insertChain(chain types.Blocks) (int, []interface{}, []*ty
 		stats.report(chain, i, bc.stateCache.TrieDB().Size())
 		if i == len(chain)-1 {
 			if (chain[i].NumberU64() % bc.chainConfig.Clique.Epoch) == 0 {
-				clique.Checkpoint <- 1
+				Checkpoint <- 1
 			}
 		}
 	}
diff --git a/miner/worker.go b/miner/worker.go
index e2ef0f5ad4..6062affc01 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -26,7 +26,6 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/consensus"
-	"github.com/ethereum/go-ethereum/consensus/clique"
 	"github.com/ethereum/go-ethereum/consensus/misc"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/state"
@@ -491,7 +490,7 @@ func (self *worker) commitNewWork() {
 	}
 	if (work.Block.NumberU64() % work.config.Clique.Epoch) == 0 {
 		log.Info("hey checkpoint")
-		clique.Checkpoint <- 1
+		core.Checkpoint <- 1
 	}
 	self.push(work)
 }