diff --git a/src/mame/drivers/m5.cpp b/src/mame/drivers/m5.cpp
index 79c405648a5..55f8679a087 100644
--- a/src/mame/drivers/m5.cpp
+++ b/src/mame/drivers/m5.cpp
@@ -832,7 +832,7 @@ static INPUT_PORTS_START( m5 )
 	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_STOP)        PORT_CHAR('.') PORT_CHAR('>')
 	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_SLASH)       PORT_CHAR('/') PORT_CHAR('?') PORT_CHAR(UCHAR_MAMEKEY(DOWN))
 	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("_  Triangle") PORT_CODE(KEYCODE_TILDE) PORT_CHAR('_')
-	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_BACKSLASH2)  PORT_CHAR('\\') PORT_CHAR('|')
+	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_BACKSPACE)   PORT_CHAR('\\') PORT_CHAR('|') // backslash ok for m5p, shows as ¥ on m5.
 
 	PORT_START("Y6")
 	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_O)           PORT_CHAR('o') PORT_CHAR('O')