diff --git a/src/mame/drivers/mhavoc.c b/src/mame/drivers/mhavoc.c
index d9f9de24558..af548261993 100644
--- a/src/mame/drivers/mhavoc.c
+++ b/src/mame/drivers/mhavoc.c
@@ -418,7 +418,7 @@ static INPUT_PORTS_START( mhavocrv )
 
 	PORT_MODIFY("IN1")
 	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM(tms5220_r, NULL)
-	PORT_BIT( 0x0b, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
 INPUT_PORTS_END
 
 static INPUT_PORTS_START( mhavocp )