diff --git a/src/mame/drivers/midyunit.cpp b/src/mame/drivers/midyunit.cpp
index 2995ca04119..79095214631 100644
--- a/src/mame/drivers/midyunit.cpp
+++ b/src/mame/drivers/midyunit.cpp
@@ -380,7 +380,7 @@ static INPUT_PORTS_START( hiimpact )
 	PORT_START("IN1")
 	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_COIN1 )
 	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_COIN2 )
-	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_START ) PORT_PLAYER(1)
+	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_START1 ) PORT_PLAYER(1)
 	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_TILT ) /* Slam Switch */
 	PORT_SERVICE( 0x0010, IP_ACTIVE_LOW )
 	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_START ) PORT_PLAYER(2)