diff --git a/pytorch_lightning/metrics/functional/classification.py b/pytorch_lightning/metrics/functional/classification.py
index d91e5ebae1040..a0466d6c5ba93 100644
--- a/pytorch_lightning/metrics/functional/classification.py
+++ b/pytorch_lightning/metrics/functional/classification.py
@@ -387,4 +387,4 @@ def dice_score(pred: torch.Tensor, target: torch.Tensor, bg: bool = False,
             score_cls = (2 * tp).to(torch.float) / denom
 
         scores[i] += score_cls
-    return reduce(scores, reduction=reduction)
\ No newline at end of file
+    return reduce(scores, reduction=reduction)