diff --git a/src/pytest_bdd/scenario.py b/src/pytest_bdd/scenario.py
index 864346ce..1941b9cd 100644
--- a/src/pytest_bdd/scenario.py
+++ b/src/pytest_bdd/scenario.py
@@ -162,9 +162,11 @@ def _execute_step_function(
         raise
 
     if context.target_fixture is not None:
-        target_fixture_tokens = [token for token in context.target_fixture.split(',') if token]
+        target_fixture_tokens = [token for token in context.target_fixture.split(",") if token]
         return_values = (return_value,) if not isinstance(return_value, tuple) else return_value
-        assert len(target_fixture_tokens) == len(return_values), f"Return value count: {len(return_values)} are not matching target_fixture count: {len(target_fixture_tokens)}"
+        assert len(target_fixture_tokens) == len(
+            return_values
+        ), f"Return value count: {len(return_values)} are not matching target_fixture count: {len(target_fixture_tokens)}"
         for token, value in zip(target_fixture_tokens, return_values):
             inject_fixture(request, token, value)
 
diff --git a/tests/steps/test_given.py b/tests/steps/test_given.py
index caa890b9..ee78a222 100644
--- a/tests/steps/test_given.py
+++ b/tests/steps/test_given.py
@@ -76,4 +76,4 @@ def _(foo, bar):
         )
     )
     result = pytester.runpytest()
-    result.assert_outcomes(passed=1)
\ No newline at end of file
+    result.assert_outcomes(passed=1)