diff --git a/pytorch_lightning/models/trainer.py b/pytorch_lightning/models/trainer.py
index 62df9ef4f9..74b147e3d2 100644
--- a/pytorch_lightning/models/trainer.py
+++ b/pytorch_lightning/models/trainer.py
@@ -19,7 +19,7 @@ import tqdm
 from pytorch_lightning.root_module.memory import get_gpu_memory_map
 from pytorch_lightning.root_module.model_saving import TrainerIO
 from pytorch_lightning.pt_overrides.override_data_parallel import LightningDistributedDataParallel, LightningDataParallel
-
+from pytorch_lightning.utils.debugging import ForkedPdb
 
 try:
     from apex import amp
@@ -254,8 +254,7 @@ class Trainer(TrainerIO):
 
     @property
     def __tng_tqdm_dic(self):
-        import pdb
-        pdb.set_trace()
+        ForkedPdb().set_trace()
         tqdm_dic = {
             'tng_loss': '{0:.3f}'.format(self.avg_loss),
             'v_nb': '{}'.format(self.experiment.version),
diff --git a/tests/test_models.py b/tests/test_models.py
index 580ba1afda..a02bde91a7 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -242,6 +242,5 @@ def test_amp_gpu_ddp():
 
 
 
-
 if __name__ == '__main__':
     pytest.main([__file__])