diff --git a/train.py b/train.py
index 3b0e4d6b93..a470606813 100644
--- a/train.py
+++ b/train.py
@@ -54,6 +54,7 @@ def train_net(net,
 
     for epoch in range(epochs):
         print('Starting epoch {}/{}.'.format(epoch + 1, epochs))
+        net.train()
 
         # reset the generators
         train = get_imgs_and_masks(iddataset['train'], dir_img, dir_mask, img_scale)