diff --git a/credit/datasets/era5_multistep_batcher.py b/credit/datasets/era5_multistep_batcher.py
index f13ca28..bbf7a3c 100644
--- a/credit/datasets/era5_multistep_batcher.py
+++ b/credit/datasets/era5_multistep_batcher.py
@@ -337,7 +337,7 @@ def set_epoch(self, epoch):
         self.initialize_batch()
 
     def batches_per_epoch(self):
-        return math.ceil((self.batch_indices) / self.batch_size)
+        return math.ceil(len(self.batch_indices) / self.batch_size)
 
     def __getitem__(self, _):
         """