diff --git a/src/mame/misc/mtu130.cpp b/src/mame/misc/mtu130.cpp
index 06daac57b47..b3232f3fdb6 100644
--- a/src/mame/misc/mtu130.cpp
+++ b/src/mame/misc/mtu130.cpp
@@ -686,7 +686,7 @@ static INPUT_PORTS_START(mtu130)
 	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNUSED)
 	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_RSHIFT)      PORT_CHAR(UCHAR_SHIFT_2) PORT_NAME("RIGHT SHIFT")
 	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LSHIFT)      PORT_CHAR(UCHAR_SHIFT_1) PORT_NAME("LEFT SHIFT")
-	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_CAPSLOCK)    PORT_CHAR(UCHAR_MAMEKEY(CAPSLOCK))
+	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_CAPSLOCK)    PORT_CHAR(UCHAR_MAMEKEY(CAPSLOCK)) PORT_TOGGLE
 	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LCONTROL)    PORT_NAME("CTRL")
 	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD)                                PORT_NAME("REPEAT")