diff --git a/src/mame/drivers/namcos11.c b/src/mame/drivers/namcos11.c
index 9850ae60282..7413180949a 100644
--- a/src/mame/drivers/namcos11.c
+++ b/src/mame/drivers/namcos11.c
@@ -982,7 +982,7 @@ static DRIVER_INIT( namcos11 )
 		n_game++;
 	}
 
-	if( strcmp( machine.system().name, "ptblank2a" ) == 0 )
+	if( strcmp( machine.system().name, "ptblank2ua" ) == 0 )
 	{
 		machine.device("maincpu")->memory().space(AS_PROGRAM)->install_legacy_write_handler(0x1f788000, 0x1f788003, FUNC(lightgun_w) );
 		machine.device("maincpu")->memory().space(AS_PROGRAM)->install_legacy_read_handler (0x1f780000, 0x1f78000f, FUNC(lightgun_r) );