diff --git a/utils/utils.py b/utils/utils.py
index 91dc62a9..4a7e969a 100755
--- a/utils/utils.py
+++ b/utils/utils.py
@@ -549,7 +549,7 @@ def non_max_suppression(prediction, conf_thres=0.5, iou_thres=0.5, multi_cls=Tru
 
         # Batched NMS
         if method == 'vision_batch':
-            c = j * 0 if agnostic else j  # class-agnostic NMS
+            c = pred[:, 5] * 0 if agnostic else pred[:, 5]  # class-agnostic NMS
             output[image_i] = pred[torchvision.ops.boxes.batched_nms(pred[:, :4], pred[:, 4], c, iou_thres)]
             continue