diff --git a/pytorch_image_models/train.py b/pytorch_image_models/train.py
index f26de3f..41ada75 100644
--- a/pytorch_image_models/train.py
+++ b/pytorch_image_models/train.py
@@ -96,7 +96,7 @@
                     help='Allow download of dataset for torch/ and tfds/ datasets that support it.')
 group.add_argument('--class-map', default='', type=str, metavar='FILENAME',
                     help='path to class to idx mapping file (default: "")')
-group.add_argument('--select_indices', default=[], type=str, nargs='+',
+group.add_argument('--select-indices', default=[], type=str, nargs='+',
                     help='pre-defined subset indices')
 
 # Model parameters