diff --git a/tests/unit/config/test_config_file.py b/tests/unit/config/test_config_file.py
index f464ff78..6dcb6769 100644
--- a/tests/unit/config/test_config_file.py
+++ b/tests/unit/config/test_config_file.py
@@ -53,6 +53,7 @@ class TestConfigFilePartiallyValidatesPresets:
     def test_success__empty_plugins(self, plugin: str):
         excluded_plugins = [
             "embed_thumbnail",  # value is bool, not dict
+            "format",  # value is string, not dict
         ]
         if plugin not in excluded_plugins:
             self._partial_validate({plugin: {}})