diff --git a/src/ahriman/application/handlers/search.py b/src/ahriman/application/handlers/search.py
index 72f2f433..de451b11 100644
--- a/src/ahriman/application/handlers/search.py
+++ b/src/ahriman/application/handlers/search.py
@@ -40,7 +40,7 @@ class Search(Handler):
     """
 
     ALLOW_AUTO_ARCHITECTURE_RUN = False  # it should be called only as "no-architecture"
-    SORT_FIELDS = {field.name for field in fields(AURPackage) if field.default_factory is not list}
+    SORT_FIELDS = {field.name for field in fields(AURPackage) if field.default_factory is not list}  # type: ignore
 
     @classmethod
     def run(cls: Type[Handler], args: argparse.Namespace, architecture: str, configuration: Configuration, *,
diff --git a/tests/ahriman/application/handlers/test_handler_search.py b/tests/ahriman/application/handlers/test_handler_search.py
index 25ee83ae..47c2dd7b 100644
--- a/tests/ahriman/application/handlers/test_handler_search.py
+++ b/tests/ahriman/application/handlers/test_handler_search.py
@@ -131,9 +131,10 @@ def test_disallow_auto_architecture_run() -> None:
     assert not Search.ALLOW_AUTO_ARCHITECTURE_RUN
 
 
-def test_sort_fields() -> None:
+def test_sort_fields(aur_package_ahriman: AURPackage) -> None:
     """
     must store valid field list which are allowed to be used for sorting
     """
     expected = {field.name for field in dataclasses.fields(AURPackage)}
     assert all(field in expected for field in Search.SORT_FIELDS)
+    assert all(not isinstance(getattr(aur_package_ahriman, field), list) for field in Search.SORT_FIELDS)