diff --git a/Arcade_MiST/Williams 6809 rev.2 Hardware/rtl/tshoot_sound_board.vhd b/Arcade_MiST/Williams 6809 rev.2 Hardware/rtl/tshoot_sound_board.vhd
index f00b8d3e..55520f4b 100644
--- a/Arcade_MiST/Williams 6809 rev.2 Hardware/rtl/tshoot_sound_board.vhd	
+++ b/Arcade_MiST/Williams 6809 rev.2 Hardware/rtl/tshoot_sound_board.vhd	
@@ -134,7 +134,7 @@ pia_rw_n <=   '0' when cpu_rw_n = '0' and pia_cs = '1' else '1';
 cpu_di <=
 	wram_do when wram_cs = '1' else
 	sound_select when pia_cs = '1' and hwsel = HW_INFERNO else	
-	pia_do  when pia_cs = '1' and hwsel <> HW_INFERNO else
+	pia_do  when pia_cs = '1' and hwsel /= HW_INFERNO else
 	rom_do when rom_cs = '1' else X"55";
 
 -- pia irqs to cpu