diff --git a/src/openttd.cpp b/src/openttd.cpp
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -1395,8 +1395,7 @@ void StateGameLoop()
 	} else {
 		if (_debug_desync_level > 2 && TimerGameCalendar::date_fract == 0 && (TimerGameCalendar::date & 0x1F) == 0) {
 			/* Save the desync savegame if needed. */
-			char name[MAX_PATH];
-			seprintf(name, lastof(name), "dmp_cmds_%08x_%08x.sav", _settings_game.game_creation.generation_seed, TimerGameCalendar::date);
+			std::string name = fmt::format("dmp_cmds_{:08x}_{:08x}.sav", _settings_game.game_creation.generation_seed, TimerGameCalendar::date);
 			SaveOrLoad(name, SLO_SAVE, DFT_GAME_FILE, AUTOSAVE_DIR, false);
 		}