diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a240462..1ce2fe73 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -62,6 +62,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 - Fixed a bug that caused the `callbacks` Trainer argument to reference a global variable ([#1534](https://github.com/PyTorchLightning/pytorch-lightning/pull/1534)).
 
+- Fixed a bug that set all boolean CLI arguments from Trainer.add_argparse_args always to True ([#1570](https://github.com/PyTorchLightning/pytorch-lightning/issues/1570))
 
 ## [0.7.3] - 2020-04-09
 
diff --git a/pytorch_lightning/trainer/trainer.py b/pytorch_lightning/trainer/trainer.py
index e4a33fb4..20ef14ca 100644
--- a/pytorch_lightning/trainer/trainer.py
+++ b/pytorch_lightning/trainer/trainer.py
@@ -603,7 +603,7 @@ class Trainer(
         for arg, arg_types, arg_default in (at for at in cls.get_init_arguments_and_types()
                                             if at[0] not in depr_arg_names):
             for allowed_type in (at for at in allowed_types if at in arg_types):
-                if isinstance(allowed_type, bool):
+                if allowed_type is bool:
                     def allowed_type(x):
                         return bool(distutils.util.strtobool(x))
                 parser.add_argument(