diff --git a/pkg/util/lock/metrics_mutex_test.go b/pkg/util/lock/metrics_mutex_test.go
index 8db946c966..3f050b713a 100644
--- a/pkg/util/lock/metrics_mutex_test.go
+++ b/pkg/util/lock/metrics_mutex_test.go
@@ -23,15 +23,15 @@ func TestMetricsLockLock(t *testing.T) {
 	testRWLock := lManager.applyRWLock(lName)
 	wg := sync.WaitGroup{}
 	testRWLock.Lock("main_thread")
+	wg.Add(1)
 	go func() {
-		wg.Add(1)
+		defer wg.Done()
 		before := time.Now()
 		testRWLock.Lock("sub_thread")
 		lkDuration := time.Since(before)
 		assert.True(t, lkDuration >= lockDuration)
 		testRWLock.UnLock("sub_threadXX")
 		testRWLock.UnLock("sub_thread")
-		wg.Done()
 	}()
 	time.Sleep(lockDuration)
 	testRWLock.UnLock("main_thread")
@@ -52,14 +52,14 @@ func TestMetricsLockRLock(t *testing.T) {
 	testRWLock := lManager.applyRWLock(lName)
 	wg := sync.WaitGroup{}
 	testRWLock.RLock("main_thread")
+	wg.Add(1)
 	go func() {
-		wg.Add(1)
+		defer wg.Done()
 		before := time.Now()
 		testRWLock.Lock("sub_thread")
 		lkDuration := time.Since(before)
 		assert.True(t, lkDuration >= lockDuration)
 		testRWLock.UnLock("sub_thread")
-		wg.Done()
 	}()
 	time.Sleep(lockDuration)
 	assert.Equal(t, 1, len(testRWLock.acquireTimeMap))