diff --git a/src/burn/drv/pre90s/d_megasys1.cpp b/src/burn/drv/pre90s/d_megasys1.cpp
index 072a7d12a..a77dd2815 100644
--- a/src/burn/drv/pre90s/d_megasys1.cpp
+++ b/src/burn/drv/pre90s/d_megasys1.cpp
@@ -4929,7 +4929,7 @@ struct BurnDriver BurnDrvMonkelf = {
 	"monkelf", "avspirit", NULL, NULL, "1990",
 	"Monky Elf (Korean bootleg of Avenging Spirit)\0", "imperfect graphics", "bootleg", "Mega System 1",
 	NULL, NULL, NULL, NULL,
-	BDF_CLONE | BDF_BOOTLEG, 2, HARDWARE_MISC_POST90S, GBF_SCRFIGHT, 0,
+	BDF_GAME_WORKING | BDF_CLONE | BDF_BOOTLEG, 2, HARDWARE_MISC_POST90S, GBF_SCRFIGHT, 0,
 	NULL, monkelfRomInfo, monkelfRomName, NULL, NULL, CommonInputInfo, AvspiritDIPInfo,
 	monkelfInit, DrvExit, System1BFrame, DrvDraw, DrvScan, &DrvRecalc, 0x400,
 	256, 224, 4, 3