diff --git a/src/mame/drivers/metro.c b/src/mame/drivers/metro.c
index f32484a7304..475f9eee39c 100644
--- a/src/mame/drivers/metro.c
+++ b/src/mame/drivers/metro.c
@@ -2140,9 +2140,9 @@ static WRITE8_HANDLER( puzzlet_portb_w )
 }
 
 static ADDRESS_MAP_START( puzzlet_io_map, ADDRESS_SPACE_IO, 8 )
-	AM_RANGE( H8_PORT7,		H8_PORT_7	)	AM_READ_PORT("IN2")
-	AM_RANGE( H8_SERIAL_B,	H8_SERIAL_1	)	AM_READ_PORT("IN0")		// coin
-	AM_RANGE( H8_PORTB,		H8_PORT_B	)	AM_READ_PORT("DSW0") AM_WRITE( puzzlet_portb_w )
+	AM_RANGE( H8_PORT7,		H8_PORT7	)	AM_READ_PORT("IN2")
+	AM_RANGE( H8_SERIAL_B,	H8_SERIAL_B	)	AM_READ_PORT("IN0")		// coin
+	AM_RANGE( H8_PORTB,		H8_PORTB	)	AM_READ_PORT("DSW0") AM_WRITE( puzzlet_portb_w )
 ADDRESS_MAP_END