diff --git a/server/internal/service/delivery_task_test.go b/server/internal/service/delivery_task_test.go
index 77c5ea4..b1f2b2f 100644
--- a/server/internal/service/delivery_task_test.go
+++ b/server/internal/service/delivery_task_test.go
@@ -354,14 +354,14 @@ func TestSubscribeTask_ConcurrentSafety(t *testing.T) {
 	const goroutines = 50
 
 	// 并发订阅
-	cancels := make([]func(), 0, goroutines)
+	cancels := make([]func(), goroutines)
 	for i := 0; i < goroutines; i++ {
 		wg.Add(1)
-		go func() {
+		go func(idx int) {
 			defer wg.Done()
 			_, cancel := svc.SubscribeTask(taskID)
-			cancels = append(cancels, cancel)
-		}()
+			cancels[idx] = cancel
+		}(i)
 	}
 	wg.Wait()