diff --git a/pytorch_lightning/trainer/trainer.py b/pytorch_lightning/trainer/trainer.py
index 92f34955c7..43babc0b34 100644
--- a/pytorch_lightning/trainer/trainer.py
+++ b/pytorch_lightning/trainer/trainer.py
@@ -68,7 +68,6 @@ from pytorch_lightning.utilities.memory import recursive_detach
 warnings.filterwarnings(
     'ignore', message='torch.distributed.reduce_op is deprecated, ' 'please use torch.distributed.ReduceOp instead'
 )
-os.environ['PYTHONWARNINGS'] = 'ignore:semaphore_tracker:UserWarning'
 
 try:
     from apex import amp