diff --git a/src/mame/drivers/jankenmn.cpp b/src/mame/drivers/jankenmn.cpp
index f6182842d14..10195a3d4f1 100644
--- a/src/mame/drivers/jankenmn.cpp
+++ b/src/mame/drivers/jankenmn.cpp
@@ -1,5 +1,5 @@
 // license:BSD-3-Clause
-// copyright-holders:Roberto Fresca
+// copyright-holders:Roberto Fresca, hap
 /***************************************************************************
 
   JANKENMAN UNIT
@@ -308,9 +308,9 @@ ADDRESS_MAP_END
 
 static INPUT_PORTS_START( jankenmn )
 	PORT_START("IN0")
-	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_CODE(KEYCODE_Z) PORT_NAME("Guu (Rock)")
-	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_CODE(KEYCODE_X) PORT_NAME("Choki (Scissors)")
-	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_BUTTON3 ) PORT_CODE(KEYCODE_C) PORT_NAME("Paa (Paper)")
+	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_NAME("Guu (Rock)")
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("Choki (Scissors)")
+	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_BUTTON3 ) PORT_NAME("Paa (Paper)")
 	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN )
 	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_COIN3 ) // 100 yen coin
 	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, jankenmn_state, hopper_status_r, NULL)