diff --git a/tests/studio/install/test_rocm_support.py b/tests/studio/install/test_rocm_support.py
index d41adcf379..26ed005291 100644
--- a/tests/studio/install/test_rocm_support.py
+++ b/tests/studio/install/test_rocm_support.py
@@ -1536,7 +1536,9 @@ class TestWindowsRocmIndexUrl:
         assert "repo.amd.com" in url
 
     def test_mirror_env_var_overrides_base(self, monkeypatch):
-        monkeypatch.setenv("UNSLOTH_ROCM_WINDOWS_MIRROR", "https://my-mirror.example.com/rocm/whl")
+        monkeypatch.setenv(
+            "UNSLOTH_ROCM_WINDOWS_MIRROR", "https://my-mirror.example.com/rocm/whl"
+        )
         # Reload module-level constant by calling helper directly
         url = stack_mod._windows_rocm_index_url("gfx1200")
         # The env var is read at module load time for _ROCM_WINDOWS_INDEX_BASE,