diff --git a/climax/core/dataset.py b/climax/core/dataset.py
index 83b4dc8ce22505b1279d0a3361b3603ddf72efe0..d385cfb6eb19dc4207b8193ecf7bf5bc4c9f6dba 100644
--- a/climax/core/dataset.py
+++ b/climax/core/dataset.py
@@ -250,9 +250,7 @@ class EoDataset(torch.utils.data.Dataset):
 
                 # standardized anomaly = (x(t) - mean(x, t)) / std(x, t)
                 if standard:
-                    anomalies[time] = (anomalies[time] /
-                                       ds.isel(time=time_scale).std(dim='time')
-                                       )
+                    anomalies[time] /= ds.isel(time=time_scale).std(dim='time')
 
         # concatenate anomalies and sort chronologically
         anomalies = xr.concat(anomalies.values(), dim='time')