diff --git a/test/unit/format/sam_file_format_test_template.hpp b/test/unit/format/sam_file_format_test_template.hpp
index bcc2a7f..32eaa42 100644
--- a/test/unit/format/sam_file_format_test_template.hpp
+++ b/test/unit/format/sam_file_format_test_template.hpp
@@ -238,7 +238,7 @@ TYPED_TEST_P(sam_file_read, select_fields)
 
     using record_t =
       bio::detail::record_from_typelist<std::remove_cvref_t<decltype(fid)>, std::remove_cvref_t<decltype(ftype)>>;
-    bio::map_io::reader_options default_options{};
+    bio::map_io::reader_options default_options{.field_ids = fid, .field_types = ftype};
     bio::format_input_handler<bio::sam> input_handler{istream, default_options};
     record_t rec;