diff --git a/train.py b/train.py
index 86c7e48d5a..acab089ed7 100644
--- a/train.py
+++ b/train.py
@@ -547,7 +547,7 @@ def train(hyp, opt, device, tb_writer=None):
     parser.add_argument('--single-cls', action='store_true', help='train multi-class data as single-class')
     parser.add_argument('--adam', action='store_true', help='use torch.optim.Adam() optimizer')
     parser.add_argument('--sync-bn', action='store_true', help='use SyncBatchNorm, only available in DDP mode')
-    parser.add_argument('--local_rank', type=int, default=-1, help='DDP parameter, do not modify')
+    parser.add_argument('--local-rank', type=int, default=-1, help='DDP parameter, do not modify')
     parser.add_argument('--workers', type=int, default=8, help='maximum number of dataloader workers')
     parser.add_argument('--project', default='runs/train', help='save to project/name')
     parser.add_argument('--entity', default=None, help='W&B entity')
diff --git a/train_aux.py b/train_aux.py
index 0e8053f850..0543183b60 100644
--- a/train_aux.py
+++ b/train_aux.py
@@ -544,7 +544,7 @@ def train(hyp, opt, device, tb_writer=None):
     parser.add_argument('--single-cls', action='store_true', help='train multi-class data as single-class')
     parser.add_argument('--adam', action='store_true', help='use torch.optim.Adam() optimizer')
     parser.add_argument('--sync-bn', action='store_true', help='use SyncBatchNorm, only available in DDP mode')
-    parser.add_argument('--local_rank', type=int, default=-1, help='DDP parameter, do not modify')
+    parser.add_argument('--local-rank', type=int, default=-1, help='DDP parameter, do not modify')
     parser.add_argument('--workers', type=int, default=8, help='maximum number of dataloader workers')
     parser.add_argument('--project', default='runs/train', help='save to project/name')
     parser.add_argument('--entity', default=None, help='W&B entity')