diff --git a/src/devices/bus/heathzenith/h89/sigmasoft_sound.cpp b/src/devices/bus/heathzenith/h89/sigmasoft_sound.cpp
index 7a9b080e3c8..16ee969ee6a 100644
--- a/src/devices/bus/heathzenith/h89/sigmasoft_sound.cpp
+++ b/src/devices/bus/heathzenith/h89/sigmasoft_sound.cpp
@@ -67,18 +67,18 @@ private:
 //**************************************************************************
 static INPUT_PORTS_START( sigma_sound )
 	PORT_START("joystick_p1")
-	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP )
-	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT )
-	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN )
-	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT )
-	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 )
+	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP )
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT )
+	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN )
+	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT )
+	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_BUTTON1 )
 
 	PORT_START("joystick_p2")
-	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP )    PORT_PLAYER(2)
-	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(2)
-	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN )  PORT_PLAYER(2)
-	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT )  PORT_PLAYER(2)
-	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 )        PORT_PLAYER(2)
+	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP )    PORT_PLAYER(2)
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(2)
+	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN )  PORT_PLAYER(2)
+	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT )  PORT_PLAYER(2)
+	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_BUTTON1 )        PORT_PLAYER(2)
 
 	PORT_START("CONFIG")
 	PORT_CONFNAME( 0x03, 0x01, "Port selection" )