diff --git a/src/lib/retry_test.go b/src/lib/retry_test.go
index 05fe388f5..b2be2cbe4 100644
--- a/src/lib/retry_test.go
+++ b/src/lib/retry_test.go
@@ -31,7 +31,10 @@ func TestRetryUntil(t *testing.T) {
 		return fmt.Errorf("failed")
 	}
 	assert.Error(RetryUntil(f1, RetryInitialInterval(time.Second), RetryMaxInterval(time.Second), RetryTimeout(time.Second*5)))
-	assert.LessOrEqual(i, 5)
+	// f1 called time     0s - sleep - 1s - sleep - 2s - sleep - 3s - sleep - 4s - sleep - 5s
+	// i after f1 called  1            2            3            4            5            6
+	// the i may be 5 or 6 depend on timeout or default which is seleted by the select statement
+	assert.LessOrEqual(i, 6)
 
 	f2 := func() error {
 		return nil