diff --git a/cluster.go b/cluster.go
index e698320..12c847d 100644
--- a/cluster.go
+++ b/cluster.go
@@ -448,7 +448,7 @@ func (c *Cluster) doTask(ctx context.Context, taskId string) {
 		}
 	}()
 
-	ctx = context.WithValue(ctx, "trace_id", uuid.NewV4().String)
+	ctx = context.WithValue(ctx, "trace_id", uuid.NewV4().String())
 
 	// 执行任务
 	t.Callback(ctx, t.ExtendData)
diff --git a/single.go b/single.go
index f616e05..ff82e8c 100644
--- a/single.go
+++ b/single.go
@@ -288,7 +288,7 @@ func (s *Single) doTask(ctx context.Context, call func(ctx context.Context, exte
 		}
 	}()
 
-	ctx = context.WithValue(ctx, "trace_id", uuid.NewV4().String)
+	ctx = context.WithValue(ctx, "trace_id", uuid.NewV4().String())
 
 	return call(ctx, extend)
 }