diff --git a/client/resource_group/controller/controller_test.go b/client/resource_group/controller/controller_test.go
index 5414e6386b0..3300edf700f 100644
--- a/client/resource_group/controller/controller_test.go
+++ b/client/resource_group/controller/controller_test.go
@@ -261,7 +261,9 @@ func TestControllerWithTwoGroupRequestConcurrency(t *testing.T) {
 	// wait default group request token by PeriodicReport.
 	time.Sleep(2 * time.Second)
 	counter := c2.run.requestUnitTokens[0]
+	counter.limiter.mu.Lock()
 	counter.limiter.notify()
+	counter.limiter.mu.Unlock()
 	select {
 	case res := <-recTestGroupAcquireTokenRequest:
 		re.True(res)