diff --git a/tests/test_daily_logger.cpp b/tests/test_daily_logger.cpp
index 09f7c0e5..01b75d81 100644
--- a/tests/test_daily_logger.cpp
+++ b/tests/test_daily_logger.cpp
@@ -32,10 +32,11 @@ TEST_CASE("daily_logger with dateonly calculator", "[daily_logger]")
 
 #ifdef SPDLOG_WCHAR_FILENAMES
     spdlog::memory_buf_t buf;
-    spdlog::details::os::wstr_to_utf8buf(fmt::to_string(w), buf);
 #    ifdef SPDLOG_USE_STD_FORMAT
+    spdlog::details::os::wstr_to_utf8buf(w, buf);
     auto &filename = buf;
 #    else
+    spdlog::details::os::wstr_to_utf8buf(fmt::to_string(w), buf);
     auto filename = fmt::to_string(buf);
 #    endif
 #else
@@ -199,4 +200,4 @@ TEST_CASE("daily_logger rotate", "[daily_file_sink]")
     test_rotate(days_to_run, 10, 10);
     test_rotate(days_to_run, 11, 10);
     test_rotate(days_to_run, 20, 10);
-}
\ No newline at end of file
+}