diff --git a/store/tikv/2pc.go b/store/tikv/2pc.go
index dfbbff3f24d28..794e3c2656a9b 100644
--- a/store/tikv/2pc.go
+++ b/store/tikv/2pc.go
@@ -99,6 +99,7 @@ type twoPhaseCommitter struct {
 	testingKnobs struct {
 		acAfterCommitPrimary chan struct{}
 		bkAfterCommitPrimary chan struct{}
+		noFallBack           bool
 	}
 
 	useAsyncCommit uint32
diff --git a/store/tikv/2pc_test.go b/store/tikv/2pc_test.go
index 486981c4dcdb3..a849003689a6f 100644
--- a/store/tikv/2pc_test.go
+++ b/store/tikv/2pc_test.go
@@ -47,6 +47,7 @@ var _ = SerialSuites(&testCommitterSuite{})
 func (s *testCommitterSuite) SetUpSuite(c *C) {
 	atomic.StoreUint64(&ManagedLockTTL, 3000) // 3s
 	s.OneByOneSuite.SetUpSuite(c)
+	CommitMaxBackoff = 1000
 }
 
 func (s *testCommitterSuite) SetUpTest(c *C) {
@@ -77,7 +78,6 @@ func (s *testCommitterSuite) SetUpTest(c *C) {
 	// c.Assert(err, IsNil)
 
 	s.store = store
-	CommitMaxBackoff = 1000
 }
 
 func (s *testCommitterSuite) TearDownSuite(c *C) {
@@ -1137,7 +1137,7 @@ func (s *testCommitterSuite) TestResolveMixed(c *C) {
 
 // TestSecondaryKeys tests that when async commit is enabled, each prewrite message includes an
 // accurate list of secondary keys.
-func (s *testCommitterSuite) TestPrewiteSecondaryKeys(c *C) {
+func (s *testCommitterSuite) TestPrewriteSecondaryKeys(c *C) {
 	defer config.RestoreFunc()()
 	config.UpdateGlobal(func(conf *config.Config) {
 		conf.TiKVClient.EnableAsyncCommit = true
@@ -1169,9 +1169,11 @@ func (s *testCommitterSuite) TestPrewiteSecondaryKeys(c *C) {
 	ctx := context.Background()
 	// TODO remove this when minCommitTS is returned from mockStore prewrite response.
 	committer.minCommitTS = committer.startTS + 10
+	committer.testingKnobs.noFallBack = true
 	err = committer.execute(ctx)
 	c.Assert(err, IsNil)
-	c.Assert(mock.seenPrimaryReq > 0 && mock.seenSecondaryReq > 0, IsTrue)
+	c.Assert(mock.seenPrimaryReq > 0, IsTrue)
+	c.Assert(mock.seenSecondaryReq > 0, IsTrue)
 }
 
 func (s *testCommitterSuite) TestAsyncCommit(c *C) {
diff --git a/store/tikv/prewrite.go b/store/tikv/prewrite.go
index 825a2c88f0dbc..eceaafec79282 100644
--- a/store/tikv/prewrite.go
+++ b/store/tikv/prewrite.go
@@ -135,6 +135,9 @@ func (action actionPrewrite) handleSingleBatch(c *twoPhaseCommitter, bo *Backoff
 				// commit cannot proceed. The client can then fallback to normal way to
 				// continue committing the transaction if prewrite are all finished.
 				if prewriteResp.MinCommitTs == 0 {
+					if c.testingKnobs.noFallBack {
+						return nil
+					}
 					logutil.Logger(bo.ctx).Warn("async commit cannot proceed since the returned minCommitTS is zero, "+
 						"fallback to normal path", zap.Uint64("startTS", c.startTS))
 					c.setAsyncCommit(false)