diff --git a/pkg/strategy/xmaker/strategy.go b/pkg/strategy/xmaker/strategy.go
index d2f23f3e0..680c910f0 100644
--- a/pkg/strategy/xmaker/strategy.go
+++ b/pkg/strategy/xmaker/strategy.go
@@ -3,6 +3,7 @@ package xmaker
 import (
 	"context"
 	"fmt"
+	"math"
 	"sync"
 	"time"