diff --git a/utils/utils.py b/utils/utils.py
index a07c430c..f7ce54f7 100755
--- a/utils/utils.py
+++ b/utils/utils.py
@@ -564,7 +564,7 @@ def non_max_suppression(prediction, conf_thres=0.1, iou_thres=0.6, multi_label=T
                     # weights /= weights.sum(0)  # normalize
                     # x[:, :4] = torch.mm(weights.T, x[:, :4])
                     weights = (box_iou(boxes[i], boxes) > iou_thres) * scores[None]  # box weights
-                    x[i, :4] = torch.mm(weights / weights.sum(1, keepdim=True), x[:, :4]).float()  # merged boxes
+                    x[i, :4] = torch.mm(weights, x[:, :4]).float() / weights.sum(1, keepdim=True)  # merged boxes
                 except:  # possible CUDA error https://github.com/ultralytics/yolov3/issues/1139
                     pass
         elif method == 'vision':