diff --git a/src/mame/drivers/missb2.cpp b/src/mame/drivers/missb2.cpp
index 5b9480a7c7a..dc22875d752 100644
--- a/src/mame/drivers/missb2.cpp
+++ b/src/mame/drivers/missb2.cpp
@@ -496,7 +496,7 @@ static MACHINE_CONFIG_START( missb2 )
 	MCFG_INPUT_MERGER_OUTPUT_HANDLER(INPUTLINE("audiocpu", INPUT_LINE_NMI))
 
 	MCFG_GENERIC_LATCH_8_ADD("main_to_sound")
-	MCFG_GENERIC_LATCH_DATA_PENDING_CB(DEVWRITELINE("soundnmi", input_merger_device, in_w<0>))
+	MCFG_GENERIC_LATCH_DATA_PENDING_CB(DEVWRITELINE("soundnmi", input_merger_device, in_w<1>))
 
 	MCFG_GENERIC_LATCH_8_ADD("sound_to_main")