diff --git a/pytorch_lightning/trainer/trainer.py b/pytorch_lightning/trainer/trainer.py
index c4f7028301..39085ff6ef 100644
--- a/pytorch_lightning/trainer/trainer.py
+++ b/pytorch_lightning/trainer/trainer.py
@@ -94,7 +94,7 @@ class Trainer(
         checkpoint_callback: bool = True,
         callbacks: Optional[Union[List[Callback], Callback]] = None,
         default_root_dir: Optional[str] = None,
-        gradient_clip_val: float = 0,
+        gradient_clip_val: float = 0.0,
         gradient_clip_algorithm: str = 'norm',
         process_position: int = 0,
         num_nodes: int = 1,