diff --git a/jlib/log2.h b/jlib/log2.h
index 4237f2c13141ca9be7cb7d65b74612549d88efdb..8ab5ab73b15c4db0c2caa59104d044f937e86e09 100644
--- a/jlib/log2.h
+++ b/jlib/log2.h
@@ -53,7 +53,7 @@ std::wstring
 #else
 std::string
 #endif
-& file_name = L"")
+& file_name)
 {
     try {
 		std::vector<spdlog::sink_ptr> sinks;