diff --git a/pytorch_lightning/trainer/trainer.py b/pytorch_lightning/trainer/trainer.py
index d7fcd1d6..d3f20881 100644
--- a/pytorch_lightning/trainer/trainer.py
+++ b/pytorch_lightning/trainer/trainer.py
@@ -620,11 +620,11 @@ class Trainer(
                         else:
                             return int(x)
 
-                    def arg_default(x):
-                        if ',' in x:
-                            return str(x)
-                        else:
-                            return int(x)
+                    # def arg_default(x):
+                    #     if ',' in x:
+                    #         return str(x)
+                    #     else:
+                    #         return int(x)
 
                 parser.add_argument(
                     f'--{arg}',