diff --git a/nets/yolo_training.py b/nets/yolo_training.py
index b5eede114219b7325151386810f648669b5d8e4b..da2f1f9abe2b88f9b54207ad08249bbed945bf76 100644
--- a/nets/yolo_training.py
+++ b/nets/yolo_training.py
@@ -220,7 +220,7 @@ class YOLOLoss(nn.Module):
             num_pos = torch.sum(mask)
             num_pos = torch.max(num_pos, torch.ones_like(num_pos))
         else:
-            num_pos = bs
+            num_pos = bs/3
 
         return loss, num_pos