diff --git a/pytorch_lightning/models/trainer.py b/pytorch_lightning/models/trainer.py
index d7b0b9c0..3520f23e 100644
--- a/pytorch_lightning/models/trainer.py
+++ b/pytorch_lightning/models/trainer.py
@@ -379,8 +379,8 @@ class Trainer(TrainerIO):
         root_node = os.environ['SLURM_NODELIST'].split(' ')[0]
         os.environ['MASTER_ADDR'] = root_node
         os.environ['MASTER_PORT'] = f'{port}'
-        # dist.init_process_group("nccl", rank=self.proc_rank, world_size=self.world_size)
-        dist.init_process_group("nccl")
+        dist.init_process_group("nccl", rank=self.proc_rank)
+        # dist.init_process_group("nccl")
 
     def __run_pretrain_routine(self, model):
         """