diff --git a/client/option_test.go b/client/option_test.go
index 1f8c61b0f42..c5452dbfc0c 100644
--- a/client/option_test.go
+++ b/client/option_test.go
@@ -47,7 +47,7 @@ func (s *testClientSuite) TestDynamicOptionChange(c *C) {
 	expectBool := true
 	o.setEnableTSOFollowerProxy(expectBool)
 	// Check the value changing notification.
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		<-o.enableTSOFollowerProxyCh
 		return true
 	})
diff --git a/pkg/mock/mockhbstream/mockhbstream_test.go b/pkg/mock/mockhbstream/mockhbstream_test.go
index 0e5cd02d7ea..e6d05f19d1b 100644
--- a/pkg/mock/mockhbstream/mockhbstream_test.go
+++ b/pkg/mock/mockhbstream/mockhbstream_test.go
@@ -66,13 +66,13 @@ func (s *testHeartbeatStreamSuite) TestActivity(c *C) {
 
 	// Active stream is stream1.
 	hbs.BindStream(1, stream1)
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		hbs.SendMsg(region, proto.Clone(msg).(*pdpb.RegionHeartbeatResponse))
 		return stream1.Recv() != nil && stream2.Recv() == nil
 	})
 	// Rebind to stream2.
 	hbs.BindStream(1, stream2)
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		hbs.SendMsg(region, proto.Clone(msg).(*pdpb.RegionHeartbeatResponse))
 		return stream1.Recv() == nil && stream2.Recv() != nil
 	})
@@ -83,7 +83,7 @@ func (s *testHeartbeatStreamSuite) TestActivity(c *C) {
 	c.Assert(res.GetHeader().GetError(), NotNil)
 	// Switch back to 1 again.
 	hbs.BindStream(1, stream1)
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		hbs.SendMsg(region, proto.Clone(msg).(*pdpb.RegionHeartbeatResponse))
 		return stream1.Recv() != nil && stream2.Recv() == nil
 	})
diff --git a/pkg/testutil/testutil.go b/pkg/testutil/testutil.go
index 85e82ca9c11..c3c917d7b3a 100644
--- a/pkg/testutil/testutil.go
+++ b/pkg/testutil/testutil.go
@@ -31,7 +31,7 @@ const (
 
 // CheckFunc is a condition checker that passed to WaitUntil. Its implementation
 // may call c.Fatal() to abort the test, or c.Log() to add more information.
-type CheckFunc func(c *check.C) bool
+type CheckFunc func() bool
 
 // WaitOp represents available options when execute WaitUntil
 type WaitOp struct {
@@ -63,7 +63,7 @@ func WaitUntil(c *check.C, f CheckFunc, opts ...WaitOption) {
 		opt(option)
 	}
 	for i := 0; i < option.retryTimes; i++ {
-		if f(c) {
+		if f() {
 			return
 		}
 		time.Sleep(option.sleepInterval)
diff --git a/server/api/server_test.go b/server/api/server_test.go
index 15d0b4d652d..4e62aa86d39 100644
--- a/server/api/server_test.go
+++ b/server/api/server_test.go
@@ -123,7 +123,7 @@ func mustNewCluster(c *C, num int, opts ...func(cfg *config.Config)) ([]*config.
 }
 
 func mustWaitLeader(c *C, svrs []*server.Server) {
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		var leader *pdpb.Member
 		for _, svr := range svrs {
 			l := svr.GetLeader()
diff --git a/server/api/tso_test.go b/server/api/tso_test.go
index b11e98f04d2..59039068d24 100644
--- a/server/api/tso_test.go
+++ b/server/api/tso_test.go
@@ -48,7 +48,7 @@ func (s *testTsoSuite) TearDownSuite(c *C) {
 }
 
 func (s *testTsoSuite) TestTransferAllocator(c *C) {
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		s.svr.GetTSOAllocatorManager().ClusterDCLocationChecker()
 		_, err := s.svr.GetTSOAllocatorManager().GetAllocator("dc-1")
 		return err == nil
diff --git a/server/cluster/coordinator_test.go b/server/cluster/coordinator_test.go
index 985bfd86ced..708624688b7 100644
--- a/server/cluster/coordinator_test.go
+++ b/server/cluster/coordinator_test.go
@@ -894,7 +894,7 @@ func BenchmarkPatrolRegion(b *testing.B) {
 }
 
 func waitOperator(c *C, co *coordinator, regionID uint64) {
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		return co.opController.GetOperator(regionID) != nil
 	})
 }
@@ -1206,7 +1206,7 @@ func (s *testScheduleControllerSuite) TestInterval(c *C) {
 
 func waitAddLearner(c *C, stream mockhbstream.HeartbeatStream, region *core.RegionInfo, storeID uint64) *core.RegionInfo {
 	var res *pdpb.RegionHeartbeatResponse
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		if res = stream.Recv(); res != nil {
 			return res.GetRegionId() == region.GetID() &&
 				res.GetChangePeer().GetChangeType() == eraftpb.ConfChangeType_AddLearnerNode &&
@@ -1222,7 +1222,7 @@ func waitAddLearner(c *C, stream mockhbstream.HeartbeatStream, region *core.Regi
 
 func waitPromoteLearner(c *C, stream mockhbstream.HeartbeatStream, region *core.RegionInfo, storeID uint64) *core.RegionInfo {
 	var res *pdpb.RegionHeartbeatResponse
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		if res = stream.Recv(); res != nil {
 			return res.GetRegionId() == region.GetID() &&
 				res.GetChangePeer().GetChangeType() == eraftpb.ConfChangeType_AddNode &&
@@ -1239,7 +1239,7 @@ func waitPromoteLearner(c *C, stream mockhbstream.HeartbeatStream, region *core.
 
 func waitRemovePeer(c *C, stream mockhbstream.HeartbeatStream, region *core.RegionInfo, storeID uint64) *core.RegionInfo {
 	var res *pdpb.RegionHeartbeatResponse
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		if res = stream.Recv(); res != nil {
 			return res.GetRegionId() == region.GetID() &&
 				res.GetChangePeer().GetChangeType() == eraftpb.ConfChangeType_RemoveNode &&
@@ -1255,7 +1255,7 @@ func waitRemovePeer(c *C, stream mockhbstream.HeartbeatStream, region *core.Regi
 
 func waitTransferLeader(c *C, stream mockhbstream.HeartbeatStream, region *core.RegionInfo, storeID uint64) *core.RegionInfo {
 	var res *pdpb.RegionHeartbeatResponse
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		if res = stream.Recv(); res != nil {
 			if res.GetRegionId() == region.GetID() {
 				for _, peer := range append(res.GetTransferLeader().GetPeers(), res.GetTransferLeader().GetPeer()) {
@@ -1273,7 +1273,7 @@ func waitTransferLeader(c *C, stream mockhbstream.HeartbeatStream, region *core.
 }
 
 func waitNoResponse(c *C, stream mockhbstream.HeartbeatStream) {
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		res := stream.Recv()
 		return res == nil
 	})
diff --git a/server/server_test.go b/server/server_test.go
index b0ae5ff082f..f433ac2dc31 100644
--- a/server/server_test.go
+++ b/server/server_test.go
@@ -43,7 +43,7 @@ func TestMain(m *testing.M) {
 
 func mustWaitLeader(c *C, svrs []*Server) *Server {
 	var leader *Server
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		for _, s := range svrs {
 			if !s.IsClosed() && s.member.IsLeader() {
 				leader = s
diff --git a/tests/client/client_test.go b/tests/client/client_test.go
index de8c5383e66..14207ce4242 100644
--- a/tests/client/client_test.go
+++ b/tests/client/client_test.go
@@ -90,7 +90,7 @@ func (s *clientTestSuite) TestClientLeaderChange(c *C) {
 	cli := setupCli(c, s.ctx, endpoints)
 
 	var ts1, ts2 uint64
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		p1, l1, err := cli.GetTS(context.TODO())
 		if err == nil {
 			ts1 = tsoutil.ComposeTS(p1, l1)
@@ -111,7 +111,7 @@ func (s *clientTestSuite) TestClientLeaderChange(c *C) {
 	waitLeader(c, cli.(client), cluster.GetServer(leader).GetConfig().ClientUrls)
 
 	// Check TS won't fall back after leader changed.
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		p2, l2, err := cli.GetTS(context.TODO())
 		if err == nil {
 			ts2 = tsoutil.ComposeTS(p2, l2)
@@ -140,7 +140,7 @@ func (s *clientTestSuite) TestLeaderTransfer(c *C) {
 	cli := setupCli(c, s.ctx, endpoints)
 
 	var lastTS uint64
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		physical, logical, err := cli.GetTS(context.TODO())
 		if err == nil {
 			lastTS = tsoutil.ComposeTS(physical, logical)
@@ -217,7 +217,7 @@ func (s *clientTestSuite) TestTSOAllocatorLeader(c *C) {
 	var allocatorLeaderMap = make(map[string]string)
 	for _, dcLocation := range dcLocationConfig {
 		var pdName string
-		testutil.WaitUntil(c, func(c *C) bool {
+		testutil.WaitUntil(c, func() bool {
 			pdName = cluster.WaitAllocatorLeader(dcLocation)
 			return len(pdName) > 0
 		})
@@ -423,7 +423,7 @@ func (s *clientTestSuite) TestGetTsoFromFollowerClient1(c *C) {
 
 	c.Assert(failpoint.Enable("github.com/tikv/pd/client/unreachableNetwork", "return(true)"), IsNil)
 	var lastTS uint64
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		physical, logical, err := cli.GetTS(context.TODO())
 		if err == nil {
 			lastTS = tsoutil.ComposeTS(physical, logical)
@@ -451,7 +451,7 @@ func (s *clientTestSuite) TestGetTsoFromFollowerClient2(c *C) {
 
 	c.Assert(failpoint.Enable("github.com/tikv/pd/client/unreachableNetwork", "return(true)"), IsNil)
 	var lastTS uint64
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		physical, logical, err := cli.GetTS(context.TODO())
 		if err == nil {
 			lastTS = tsoutil.ComposeTS(physical, logical)
@@ -506,7 +506,7 @@ func setupCli(c *C, ctx context.Context, endpoints []string, opts ...pd.ClientOp
 }
 
 func waitLeader(c *C, cli client, leader string) {
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		cli.ScheduleCheckLeader()
 		return cli.GetLeaderAddr() == leader
 	})
@@ -721,7 +721,7 @@ func (s *testClientSuite) TestGetRegion(c *C) {
 	err := s.regionHeartbeat.Send(req)
 	c.Assert(err, IsNil)
 
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		r, err := s.client.GetRegion(context.Background(), []byte("a"))
 		c.Assert(err, IsNil)
 		if r == nil {
@@ -759,7 +759,7 @@ func (s *testClientSuite) TestGetPrevRegion(c *C) {
 	}
 	time.Sleep(500 * time.Millisecond)
 	for i := 0; i < 20; i++ {
-		testutil.WaitUntil(c, func(c *C) bool {
+		testutil.WaitUntil(c, func() bool {
 			r, err := s.client.GetPrevRegion(context.Background(), []byte{byte(i)})
 			c.Assert(err, IsNil)
 			if i > 0 && i < regionLen {
@@ -798,7 +798,7 @@ func (s *testClientSuite) TestScanRegions(c *C) {
 	}
 
 	// Wait for region heartbeats.
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		scanRegions, err := s.client.ScanRegions(context.Background(), []byte{0}, nil, 10)
 		return err == nil && len(scanRegions) == 10
 	})
@@ -865,7 +865,7 @@ func (s *testClientSuite) TestGetRegionByID(c *C) {
 	err := s.regionHeartbeat.Send(req)
 	c.Assert(err, IsNil)
 
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		r, err := s.client.GetRegionByID(context.Background(), regionID)
 		c.Assert(err, IsNil)
 		if r == nil {
@@ -1146,7 +1146,7 @@ func (s *testClientSuite) TestScatterRegion(c *C) {
 	err := s.regionHeartbeat.Send(req)
 	regionsID := []uint64{regionID}
 	c.Assert(err, IsNil)
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		scatterResp, err := s.client.ScatterRegions(context.Background(), regionsID, pd.WithGroup("test"), pd.WithRetry(1))
 		if c.Check(err, NotNil) {
 			return false
diff --git a/tests/cluster.go b/tests/cluster.go
index 4d42ee38806..27bc32b1aba 100644
--- a/tests/cluster.go
+++ b/tests/cluster.go
@@ -611,7 +611,7 @@ func (c *TestCluster) WaitAllLeaders(testC *check.C, dcLocations map[string]stri
 	for _, dcLocation := range dcLocations {
 		wg.Add(1)
 		go func(dc string) {
-			testutil.WaitUntil(testC, func(testC *check.C) bool {
+			testutil.WaitUntil(testC, func() bool {
 				leaderName := c.WaitAllocatorLeader(dc)
 				return leaderName != ""
 			})
diff --git a/tests/pdctl/member/member_test.go b/tests/pdctl/member/member_test.go
index 6a0d72d7648..1dac74ce6a4 100644
--- a/tests/pdctl/member/member_test.go
+++ b/tests/pdctl/member/member_test.go
@@ -74,7 +74,7 @@ func (s *memberTestSuite) TestMember(c *C) {
 	args = []string{"-u", pdAddr, "member", "leader", "transfer", "pd2"}
 	_, err = pdctl.ExecuteCommand(cmd, args...)
 	c.Assert(err, IsNil)
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		return c.Check("pd2", Equals, svr.GetLeader().GetName())
 	})
 
@@ -84,7 +84,7 @@ func (s *memberTestSuite) TestMember(c *C) {
 	output, err = pdctl.ExecuteCommand(cmd, args...)
 	c.Assert(strings.Contains(string(output), "Success"), IsTrue)
 	c.Assert(err, IsNil)
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		return c.Check("pd2", Not(Equals), svr.GetLeader().GetName())
 	})
 
diff --git a/tests/server/api/api_test.go b/tests/server/api/api_test.go
index 299530f0924..6afac8da3d9 100644
--- a/tests/server/api/api_test.go
+++ b/tests/server/api/api_test.go
@@ -87,7 +87,7 @@ func (s *serverTestSuite) TestReconnect(c *C) {
 	// Make sure they proxy requests to the new leader.
 	for name, s := range cluster.GetServers() {
 		if name != leader {
-			testutil.WaitUntil(c, func(c *C) bool {
+			testutil.WaitUntil(c, func() bool {
 				res, e := http.Get(s.GetConfig().AdvertiseClientUrls + "/pd/api/v1/version")
 				c.Assert(e, IsNil)
 				defer res.Body.Close()
@@ -103,7 +103,7 @@ func (s *serverTestSuite) TestReconnect(c *C) {
 	// Request will fail with no leader.
 	for name, s := range cluster.GetServers() {
 		if name != leader && name != newLeader {
-			testutil.WaitUntil(c, func(c *C) bool {
+			testutil.WaitUntil(c, func() bool {
 				res, err := http.Get(s.GetConfig().AdvertiseClientUrls + "/pd/api/v1/version")
 				c.Assert(err, IsNil)
 				defer res.Body.Close()
diff --git a/tests/server/member/member_test.go b/tests/server/member/member_test.go
index a5df2173c2a..2eb2ef19ddd 100644
--- a/tests/server/member/member_test.go
+++ b/tests/server/member/member_test.go
@@ -111,7 +111,7 @@ func (s *memberTestSuite) TestMemberDelete(c *C) {
 	httpClient := &http.Client{Timeout: 15 * time.Second}
 	for _, t := range table {
 		c.Log(time.Now(), "try to delete:", t.path)
-		testutil.WaitUntil(c, func(c *C) bool {
+		testutil.WaitUntil(c, func() bool {
 			addr := leader.GetConfig().ClientUrls + "/pd/api/v1/members/" + t.path
 			req, err := http.NewRequest(http.MethodDelete, addr, nil)
 			c.Assert(err, IsNil)
@@ -187,7 +187,7 @@ func (s *memberTestSuite) TestLeaderPriority(c *C) {
 	server1 := cluster.GetServer(leader1)
 	addr := server1.GetConfig().ClientUrls
 	// PD leader should sync with etcd leader.
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		return cluster.GetLeader() == leader1
 	})
 	// Bind a lower priority to current leader.
@@ -195,13 +195,13 @@ func (s *memberTestSuite) TestLeaderPriority(c *C) {
 	// Wait etcd leader change.
 	leader2 := s.waitEtcdLeaderChange(c, server1, leader1)
 	// PD leader should sync with etcd leader again.
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		return cluster.GetLeader() == leader2
 	})
 }
 
 func (s *memberTestSuite) post(c *C, url string, body string) {
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		res, err := http.Post(url, "", bytes.NewBufferString(body)) // #nosec
 		c.Assert(err, IsNil)
 		b, err := io.ReadAll(res.Body)
@@ -214,7 +214,7 @@ func (s *memberTestSuite) post(c *C, url string, body string) {
 
 func (s *memberTestSuite) waitEtcdLeaderChange(c *C, server *tests.TestServer, old string) string {
 	var leader string
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		var err error
 		leader, err = server.GetEtcdLeader()
 		if err != nil {
@@ -271,7 +271,7 @@ func (s *memberTestSuite) TestLeaderResignWithBlock(c *C) {
 
 func (s *memberTestSuite) waitLeaderChange(c *C, cluster *tests.TestCluster, old string) string {
 	var leader string
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		leader = cluster.GetLeader()
 		if leader == old || leader == "" {
 			return false
@@ -383,7 +383,7 @@ func (s *leaderTestSuite) sendRequest(c *C, addr string) {
 
 func mustWaitLeader(c *C, svrs []*server.Server) *server.Server {
 	var leader *server.Server
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		for _, s := range svrs {
 			if !s.IsClosed() && s.GetMember().IsLeader() {
 				leader = s
diff --git a/tests/server/region_syncer/region_syncer_test.go b/tests/server/region_syncer/region_syncer_test.go
index aa026bc3187..3a99fdabc52 100644
--- a/tests/server/region_syncer/region_syncer_test.go
+++ b/tests/server/region_syncer/region_syncer_test.go
@@ -140,7 +140,7 @@ func (s *regionSyncerTestSuite) TestRegionSyncer(c *C) {
 	c.Assert(followerServer, NotNil)
 	cacheRegions := leaderServer.GetServer().GetBasicCluster().GetRegions()
 	c.Assert(cacheRegions, HasLen, regionLen)
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		for _, region := range cacheRegions {
 			r := followerServer.GetServer().GetBasicCluster().GetRegion(region.GetID())
 			if !(c.Check(r.GetMeta(), DeepEquals, region.GetMeta()) &&
diff --git a/tests/server/server_test.go b/tests/server/server_test.go
index e0e2dff7b8e..56b357f7fcd 100644
--- a/tests/server/server_test.go
+++ b/tests/server/server_test.go
@@ -138,7 +138,7 @@ func (s *serverTestSuite) TestLeader(c *C) {
 
 	err = cluster.GetServer(leader1).Stop()
 	c.Assert(err, IsNil)
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		leader := cluster.GetLeader()
 		return leader != leader1
 	})
diff --git a/tests/server/tso/allocator_test.go b/tests/server/tso/allocator_test.go
index 44a450409b1..b3b2002f2b0 100644
--- a/tests/server/tso/allocator_test.go
+++ b/tests/server/tso/allocator_test.go
@@ -156,7 +156,7 @@ func (s *testAllocatorSuite) TestPriorityAndDifferentLocalTSO(c *C) {
 	c.Assert(err, IsNil)
 	dcLocationConfig["pd4"] = "dc-4"
 	cluster.CheckClusterDCLocation()
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		leaderName := cluster.WaitAllocatorLeader("dc-4")
 		return leaderName != ""
 	})
@@ -180,7 +180,7 @@ func (s *testAllocatorSuite) TestPriorityAndDifferentLocalTSO(c *C) {
 	for serverName, dcLocation := range dcLocationConfig {
 		go func(serName, dc string) {
 			defer wg.Done()
-			testutil.WaitUntil(c, func(c *C) bool {
+			testutil.WaitUntil(c, func() bool {
 				leaderName := cluster.WaitAllocatorLeader(dc)
 				return leaderName == serName
 			}, testutil.WithRetryTimes(12), testutil.WithSleepInterval(5*time.Second))
@@ -231,7 +231,7 @@ func (s *testAllocatorSuite) testTSOSuffix(c *C, cluster *tests.TestCluster, am
 	allocator, err := am.GetAllocator(dcLocation)
 	c.Assert(err, IsNil)
 	var tso pdpb.Timestamp
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		tso, err = allocator.GenerateTSO(1)
 		c.Assert(err, IsNil)
 		return tso.GetPhysical() != 0
diff --git a/tests/server/tso/consistency_test.go b/tests/server/tso/consistency_test.go
index a912146d116..974c0bb71c2 100644
--- a/tests/server/tso/consistency_test.go
+++ b/tests/server/tso/consistency_test.go
@@ -345,7 +345,7 @@ func (s *testTSOConsistencySuite) TestLocalTSOAfterMemberChanged(c *C) {
 	c.Assert(err, IsNil)
 	dcLocationConfig["pd4"] = "dc-4"
 	cluster.CheckClusterDCLocation()
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		leaderName := cluster.WaitAllocatorLeader("dc-4")
 		return leaderName != ""
 	})
diff --git a/tests/server/tso/manager_test.go b/tests/server/tso/manager_test.go
index 7679cc17685..68edc073445 100644
--- a/tests/server/tso/manager_test.go
+++ b/tests/server/tso/manager_test.go
@@ -190,7 +190,7 @@ func (s *testManagerSuite) TestNextLeaderKey(c *C) {
 		}
 		err := server.GetTSOAllocatorManager().TransferAllocatorForDCLocation("dc-1", server.GetServer().GetMember().ID())
 		c.Assert(err, IsNil)
-		testutil.WaitUntil(c, func(c *C) bool {
+		testutil.WaitUntil(c, func() bool {
 			cluster.CheckClusterDCLocation()
 			currName := cluster.WaitAllocatorLeader("dc-1")
 			return currName == name
diff --git a/tests/server/watch/leader_watch_test.go b/tests/server/watch/leader_watch_test.go
index c6bc9a12756..160e089ecb7 100644
--- a/tests/server/watch/leader_watch_test.go
+++ b/tests/server/watch/leader_watch_test.go
@@ -82,7 +82,7 @@ func (s *watchTestSuite) TestWatcher(c *C) {
 	cluster.WaitLeader()
 	c.Assert(pd2.GetLeader().GetName(), Equals, pd2.GetConfig().Name)
 	failpoint.Disable("github.com/tikv/pd/server/delayWatcher")
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		return c.Check(pd3.GetLeader().GetName(), Equals, pd2.GetConfig().Name)
 	})
 	c.Succeed()
@@ -107,7 +107,7 @@ func (s *watchTestSuite) TestWatcherCompacted(c *C) {
 	c.Assert(err, IsNil)
 	err = pd2.Run()
 	c.Assert(err, IsNil)
-	testutil.WaitUntil(c, func(c *C) bool {
+	testutil.WaitUntil(c, func() bool {
 		return c.Check(pd2.GetLeader().GetName(), Equals, pd1.GetConfig().Name)
 	})
 	c.Succeed()