diff --git a/src/mame/drivers/megaphx.cpp b/src/mame/drivers/megaphx.cpp
index cd5430730a6..d79db75989c 100644
--- a/src/mame/drivers/megaphx.cpp
+++ b/src/mame/drivers/megaphx.cpp
@@ -467,4 +467,4 @@ ROM_START( hamboy )
 ROM_END
 
 GAME( 1991, megaphx,  0,        megaphx, megaphx, megaphx_state, megaphx, ROT0, "Dinamic / Inder", "Mega Phoenix", MACHINE_IMPERFECT_GRAPHICS | MACHINE_IMPERFECT_SOUND )
-GAME( 1990, hamboy,   0,        megaphx, hamboy,  hamboy_state,  megaphx, ROT0, "Dinamic / Inder", "Hammer Boy",   MACHINE_NOT_WORKING | MACHINE_IMPERFECT_GRAPHICS | MACHINE_IMPERFECT_SOUND )
+GAME( 1990, hamboy,   0,        megaphx, hamboy,  hamboy_state,  megaphx, ROT0, "Dinamic / Inder", "Hammer Boy",   MACHINE_IMPERFECT_GRAPHICS | MACHINE_IMPERFECT_SOUND )