diff --git a/train.py b/train.py
index ae68dca2..8f624b1f 100644
--- a/train.py
+++ b/train.py
@@ -198,7 +198,8 @@ def train(cfg,
 
     # Start training
     model.hyp = hyp  # attach hyperparameters to model
-    # model.class_weights = labels_to_class_weights(dataset.labels, nc).to(device)  # attach class weights
+    if dataset.image_weights:
+        model.class_weights = labels_to_class_weights(dataset.labels, nc).to(device)  # attach class weights
     model_info(model, report='summary')  # 'full' or 'summary'
     nb = len(dataloader)
     maps = np.zeros(nc)  # mAP per class