diff --git a/CHANGELOG.md b/CHANGELOG.md
index aa39cfcc..f67ba549 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 - Fixed Horovod distributed backend to set the `root_gpu` property ([#1669](https://github.com/PyTorchLightning/pytorch-lightning/pull/1669))
 
+- Fixed wandb logger `global_step` affects other loggers ([#1492](https://github.com/PyTorchLightning/pytorch-lightning/issues/1485))
 
 ## [0.7.5] - 2020-04-27
 
diff --git a/pytorch_lightning/loggers/base.py b/pytorch_lightning/loggers/base.py
index 39891c44..857d661f 100644
--- a/pytorch_lightning/loggers/base.py
+++ b/pytorch_lightning/loggers/base.py
@@ -125,7 +125,7 @@ class LightningLoggerBase(ABC):
         """
         agg_step, metrics_to_log = self._aggregate_metrics(metrics=metrics, step=step)
 
-        if metrics_to_log is not None:
+        if metrics_to_log:
             self.log_metrics(metrics=metrics_to_log, step=agg_step)
 
     @abstractmethod
diff --git a/pytorch_lightning/loggers/wandb.py b/pytorch_lightning/loggers/wandb.py
index c3486441..0d5ff985 100644
--- a/pytorch_lightning/loggers/wandb.py
+++ b/pytorch_lightning/loggers/wandb.py
@@ -119,9 +119,7 @@ class WandbLogger(LightningLoggerBase):
 
     @rank_zero_only
     def log_metrics(self, metrics: Dict[str, float], step: Optional[int] = None) -> None:
-        if step is not None:
-            metrics['global_step'] = step
-        self.experiment.log(metrics)
+        self.experiment.log(metrics, step=step)
 
     @property
     def name(self) -> str:
diff --git a/tests/loggers/test_wandb.py b/tests/loggers/test_wandb.py
index 82555f88..3a63fcb9 100644
--- a/tests/loggers/test_wandb.py
+++ b/tests/loggers/test_wandb.py
@@ -14,11 +14,11 @@ def test_wandb_logger(wandb):
     logger = WandbLogger(anonymous=True, offline=True)
 
     logger.log_metrics({'acc': 1.0})
-    wandb.init().log.assert_called_once_with({'acc': 1.0})
+    wandb.init().log.assert_called_once_with({'acc': 1.0}, step=None)
 
     wandb.init().log.reset_mock()
     logger.log_metrics({'acc': 1.0}, step=3)
-    wandb.init().log.assert_called_once_with({'global_step': 3, 'acc': 1.0})
+    wandb.init().log.assert_called_once_with({'acc': 1.0}, step=3)
 
     logger.log_hyperparams({'test': None})
     wandb.init().config.update.assert_called_once_with({'test': None}, allow_val_change=True)