diff --git a/src/mame/drivers/williams.c b/src/mame/drivers/williams.c
index ad94db8e99d..add36aaa1a3 100644
--- a/src/mame/drivers/williams.c
+++ b/src/mame/drivers/williams.c
@@ -1014,8 +1014,8 @@ static INPUT_PORTS_START( splat )
 	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICKLEFT_DOWN ) PORT_8WAY PORT_PLAYER(1)
 	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICKLEFT_LEFT ) PORT_8WAY PORT_PLAYER(1)
 	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICKLEFT_RIGHT ) PORT_8WAY PORT_PLAYER(1)
-	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_START1 )
-	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_START2 )
+	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_SPECIAL )	PORT_MIRROR(0, 4) /* IPT_START1 */
+	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_SPECIAL )	PORT_MIRROR(0, 5) /* IPT_START2 */
 	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_JOYSTICKRIGHT_UP ) PORT_8WAY PORT_PLAYER(1)
 	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_JOYSTICKRIGHT_DOWN ) PORT_8WAY PORT_PLAYER(1)
 
@@ -1222,8 +1222,8 @@ static INPUT_PORTS_START( alienar )
 	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_PLAYER(1)
 	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_PLAYER(1)
 	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(1)
-	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_START1 )
-	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_START2 )
+	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_SPECIAL )	PORT_MIRROR(0, 4) /* IPT_START1 */
+	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_SPECIAL )	PORT_MIRROR(0, 5) /* IPT_START2 */
 	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_PLAYER(1)
 	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_PLAYER(1)
 INPUT_PORTS_END