diff --git a/.circleci/config.yml b/.circleci/config.yml
index 82c703fcd3..43fd35b46d 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -37,6 +37,11 @@ jobs:
             mkdir test-reports
             pytest --cov=mlagents --cov-report xml --junitxml=test-reports/junit.xml -p no:warnings
             python-codacy-coverage -r coverage.xml
+
+      - run:
+          name: Check Code Style for ml-agents and gym_unity using black
+          command: |
+            . venv/bin/activate
             black --check ml-agents
             black --check ml-agents-envs
             black --check gym-unity
diff --git a/gym-unity/gym_unity/envs/unity_env.py b/gym-unity/gym_unity/envs/unity_env.py
index 72209209c4..3f7728d37f 100755
--- a/gym-unity/gym_unity/envs/unity_env.py
+++ b/gym-unity/gym_unity/envs/unity_env.py
@@ -212,9 +212,7 @@ def _single_step(self, info):
             visual_obs = info.visual_observations
             if isinstance(visual_obs, list):
                 visual_obs = np.array(visual_obs)
-            self.visual_obs = self._preprocess_single(
-                visual_obs[0][0, :, :, :]
-            )
+            self.visual_obs = self._preprocess_single(visual_obs[0][0, :, :, :])
             default_observation = self.visual_obs
         else:
             default_observation = info.vector_observations[0, :]