diff --git a/codes/data/Downsample_dataset.py b/codes/data/Downsample_dataset.py
index dc73e73d..5e950d05 100644
--- a/codes/data/Downsample_dataset.py
+++ b/codes/data/Downsample_dataset.py
@@ -49,7 +49,7 @@ class DownsampleDataset(data.Dataset):
         GT_size = self.opt['target_size'] * scale
 
         # get GT image
-        GT_path = self.paths_GT[index]
+        GT_path = self.paths_GT[index % len(self.paths_GT)]
         resolution = [int(s) for s in self.sizes_GT[index].split('_')
                       ] if self.data_type == 'lmdb' else None
         img_GT = util.read_img(self.GT_env, GT_path, resolution)
@@ -59,7 +59,6 @@ class DownsampleDataset(data.Dataset):
             img_GT = util.channel_convert(img_GT.shape[2], self.opt['color'], [img_GT])[0]
 
         # get LQ image
-        lqind = index % len(self.paths_LQ)
         LQ_path = self.paths_LQ[index % len(self.paths_LQ)]
         resolution = [int(s) for s in self.sizes_LQ[index].split('_')
                       ] if self.data_type == 'lmdb' else None
@@ -116,4 +115,4 @@ class DownsampleDataset(data.Dataset):
         return {'LQ': img_GT, 'GT': img_LQ, 'PIX': img_Downsampled, 'LQ_path': LQ_path, 'GT_path': GT_path}
 
     def __len__(self):
-        return len(self.paths_GT)
+        return max(len(self.paths_GT), len(self.paths_LQ))