diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index 3807c3e971cc..f5a98af3b325 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -1254,6 +1254,8 @@ static int __init i8042_create_aux_port(int idx)
 	} else {
 		snprintf(serio->name, sizeof(serio->name), "i8042 AUX%d port", idx);
 		snprintf(serio->phys, sizeof(serio->phys), I8042_MUX_PHYS_DESC, idx + 1);
+		strlcpy(serio->firmware_id, i8042_aux_firmware_id,
+			sizeof(serio->firmware_id));
 	}
 
 	port->serio = serio;