diff --git a/fastNLP/core/loss.py b/fastNLP/core/loss.py
index 8d866bbf..8a0eedd7 100644
--- a/fastNLP/core/loss.py
+++ b/fastNLP/core/loss.py
@@ -37,5 +37,7 @@ class Loss(object):
         """
         if loss_name == "cross_entropy":
             return torch.nn.CrossEntropyLoss()
+        elif loss_name == 'nll':
+            return torch.nn.NLLLoss()
         else:
             raise NotImplementedError