diff --git a/update-server/tests/openembedded/conftest.py b/update-server/tests/openembedded/conftest.py
index 81bd12dbf5c..772d2dacb7c 100644
--- a/update-server/tests/openembedded/conftest.py
+++ b/update-server/tests/openembedded/conftest.py
@@ -43,11 +43,6 @@ async def test_cli(
     return client
 
 
-def mock_root_fs_interface_() -> MagicMock:
-    """Mock RootFSInterface."""
-    return MagicMock(spec=RootFSInterface)
-
-
 @pytest.fixture
 def mock_root_fs_interface() -> MagicMock:
     """Mock RootFSInterface."""