diff --git a/tests/unit/config/test_config_file.py b/tests/unit/config/test_config_file.py
index 3bd98d6e..1bed7504 100644
--- a/tests/unit/config/test_config_file.py
+++ b/tests/unit/config/test_config_file.py
@@ -55,6 +55,7 @@ class TestConfigFilePartiallyValidatesPresets:
     def test_success__empty_plugins(self, plugin: str):
         excluded_plugins = [
             "embed_thumbnail",  # value is bool, not dict
+            "square_thumbnail",
             "format",  # value is string, not dict
             "filter_include",  # is list
             "filter_exclude",  # is list