diff --git a/src/mame/drivers/tatsumi.c b/src/mame/drivers/tatsumi.c
index 31d968c49aa..59af391466b 100644
--- a/src/mame/drivers/tatsumi.c
+++ b/src/mame/drivers/tatsumi.c
@@ -472,7 +472,7 @@ static INPUT_PORTS_START( roundup5 )
 	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1) PORT_NAME("Accelerator")
 	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1) PORT_NAME("Brake")
-	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(1) PORT_NAME("Shift")
+	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(1) PORT_NAME("Shift") PORT_TOGGLE
 	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON4 ) PORT_PLAYER(1) PORT_NAME("Turbo")
 	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_START1 )
 	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_UNKNOWN )