diff --git a/src/pytest_bdd/scenario.py b/src/pytest_bdd/scenario.py
index 30a9b97e..004fb7ea 100644
--- a/src/pytest_bdd/scenario.py
+++ b/src/pytest_bdd/scenario.py
@@ -167,7 +167,7 @@ def _execute_step_function(
             inject_fixture(request=request, arg=arg, value=return_value)
         else:
             target_fixture_tokens = [token for token in context.target_fixture.split(",") if token]
-            # Single return value in target_fixture 
+            # Single return value in target_fixture
             if len(target_fixture_tokens) == 1:
                 inject_fixture(request=request, arg=target_fixture_tokens[0], value=return_value)
             # Multiple comma separated return values in target_fixture
diff --git a/src/pytest_bdd/steps.py b/src/pytest_bdd/steps.py
index b29cb419..fd9f8338 100644
--- a/src/pytest_bdd/steps.py
+++ b/src/pytest_bdd/steps.py
@@ -111,7 +111,14 @@ def when(
 
     :return: Decorator function for the step.
     """
-    return step(name, WHEN, converters=converters, target_fixture=target_fixture, target_exception=target_exception, stacklevel=stacklevel)
+    return step(
+        name,
+        WHEN,
+        converters=converters,
+        target_fixture=target_fixture,
+        target_exception=target_exception,
+        stacklevel=stacklevel,
+    )
 
 
 def then(
diff --git a/tests/feature/test_steps.py b/tests/feature/test_steps.py
index 343cff2d..99ccaac6 100644
--- a/tests/feature/test_steps.py
+++ b/tests/feature/test_steps.py
@@ -609,7 +609,7 @@ def test_when_exception(pytester):
         @scenario("when_exception.feature", "Test when exception is generated")
         def test_when_exception():
             pass
-        
+
         @when("I have injected exception", target_fixture="foo")
         def _():
             return Exception("Dummy Exception obj")