diff --git a/pyciemss/ouu/ouu.py b/pyciemss/ouu/ouu.py
index 962511fd..2390b67f 100644
--- a/pyciemss/ouu/ouu.py
+++ b/pyciemss/ouu/ouu.py
@@ -185,7 +185,9 @@ def __init__(
         maxfeval: int = 100,
         maxiter: int = 100,
         u_bounds: np.ndarray = np.atleast_2d([[0], [1]]),
-        progress_hook: Callable[[np.array, float, bool], bool] = lambda x, f, accept: False,
+        progress_hook: Callable[
+            [np.array, float, bool], bool
+        ] = lambda x, f, accept: False,
     ):
         self.x0 = np.squeeze(np.array([x0]))
         self.objfun = objfun
diff --git a/tests/test_interfaces.py b/tests/test_interfaces.py
index d65e53d5..3db6e496 100644
--- a/tests/test_interfaces.py
+++ b/tests/test_interfaces.py
@@ -634,9 +634,7 @@ def __call__(self, x, f, accept):
         intervened_result_subset, start_time, end_time, logging_step_size, num_samples
     )
 
-    assert len(progress_hook.coordinates) == (
-        optimize_kwargs["maxiter"] + 1
-    )
+    assert len(progress_hook.coordinates) == (optimize_kwargs["maxiter"] + 1)
 
 
 @pytest.mark.parametrize("model_fixture", MODELS)