diff --git a/thirdparty/fmt/include/fmt/ostream.h b/thirdparty/fmt/include/fmt/ostream.h
index c3cdd4a61b..2631645b2f 100644
--- a/thirdparty/fmt/include/fmt/ostream.h
+++ b/thirdparty/fmt/include/fmt/ostream.h
@@ -84,10 +84,10 @@ inline bool write_ostream_unicode(std::ostream& os, fmt::string_view data) {
 #elif defined(_WIN32) && defined(__GLIBCXX__)
   auto* rdbuf = os.rdbuf();
   FILE* c_file;
-  if (auto* fbuf = dynamic_cast<__gnu_cxx::stdio_sync_filebuf<char>*>(rdbuf))
-    c_file = fbuf->file();
-  else if (auto* fbuf = dynamic_cast<__gnu_cxx::stdio_filebuf<char>*>(rdbuf))
-    c_file = fbuf->file();
+  if (auto* fbuf_sy = dynamic_cast<__gnu_cxx::stdio_sync_filebuf<char>*>(rdbuf))
+    c_file = fbuf_sy->file();
+  else if (auto* fbuf_as = dynamic_cast<__gnu_cxx::stdio_filebuf<char>*>(rdbuf))
+    c_file = fbuf_as->file();
   else
     return false;
   if (c_file) return write_console(c_file, data);