diff --git a/tests/test_firm.py b/tests/test_firm.py
index a35a7398b..857b346fd 100644
--- a/tests/test_firm.py
+++ b/tests/test_firm.py
@@ -1074,4 +1074,4 @@ def test_adj_cost_dKp1(K, Kp1, p, method, expected):
     Test of the firm capital adjustment cost function.
     """
     test_val = firm.adj_cost_dKp1(K, Kp1, p, method)
-    assert np.allclose(test_val, expected)
\ No newline at end of file
+    assert np.allclose(test_val, expected)