diff --git a/miner/worker.go b/miner/worker.go
index 346dd8ccb1..f646862612 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -169,12 +169,12 @@ type worker struct {
 	running int32 // The indicator whether the consensus engine is running or not.
 	newTxs  int32 // New arrival transaction count since last sealing work submitting.
 
-	// noempty is the flag used to control whether the feature of pre-seal
-	// empty block is enabled. The default value is false.
-	// But in some special scenario the consensus engine will seal blocks
-	// instantaneously, in this case this feature will add all empty blocks
-	// into canonical chain non-stop and no real transaction will be included.
-	noempty bool
+	// noempty is the flag used to control whether the feature of pre-seal empty
+	// block is enabled. The default value is false(pre-seal is enabled by default).
+	// But in some special scenario the consensus engine will seal blocks instantaneously,
+	// in this case this feature will add all empty blocks into canonical chain
+	// non-stop and no real transaction will be included.
+	noempty uint32
 
 	// External functions
 	isLocalBlock func(block *types.Block) bool // Function used to determine whether the specified block is mined by local miner.
@@ -256,12 +256,12 @@ func (w *worker) setRecommitInterval(interval time.Duration) {
 
 // disablePreseal disables pre-sealing mining feature
 func (w *worker) disablePreseal() {
-	w.noempty = true
+	atomic.StoreUint32(&w.noempty, 1)
 }
 
 // enablePreseal enables pre-sealing mining feature
 func (w *worker) enablePreseal() {
-	w.noempty = false
+	atomic.StoreUint32(&w.noempty, 0)
 }
 
 // pending returns the pending state and corresponding block.
@@ -930,7 +930,7 @@ func (w *worker) commitNewWork(interrupt *int32, noempty bool, timestamp int64)
 
 	// Create an empty block based on temporary copied state for
 	// sealing in advance without waiting block execution finished.
-	if !noempty && !w.noempty {
+	if !noempty && atomic.LoadUint32(&w.noempty) == 0 {
 		w.commit(uncles, nil, false, tstart)
 	}
 
@@ -943,7 +943,7 @@ func (w *worker) commitNewWork(interrupt *int32, noempty bool, timestamp int64)
 	// Short circuit if there is no available pending transactions.
 	// But if we disable empty precommit already, ignore it. Since
 	// empty block is necessary to keep the liveness of the network.
-	if len(pending) == 0 && !w.noempty {
+	if len(pending) == 0 && atomic.LoadUint32(&w.noempty) == 0 {
 		w.updateSnapshot()
 		return
 	}