diff --git a/src/superio/nuvoton/common/early_serial.c b/src/superio/nuvoton/common/early_serial.c
index ed5fdbab1f..398678983a 100644
--- a/src/superio/nuvoton/common/early_serial.c
+++ b/src/superio/nuvoton/common/early_serial.c
@@ -53,14 +53,11 @@ void nuvoton_enable_serial(pnp_devfn_t dev, u16 iobase)
 	nuvoton_pnp_enter_conf_state(dev);
 
 	if (CONFIG(SUPERIO_NUVOTON_NCT5539D_COM_A) ||
+	    CONFIG(SUPERIO_NUVOTON_NCT6791D_COM_A) ||
 	    CONFIG(SUPERIO_NUVOTON_NCT6776_COM_A))
 		/* Route COM A to GPIO8 pin group */
 		pnp_unset_and_set_config(dev, 0x2a, 1 << 7, 0);
 
-	if (CONFIG(SUPERIO_NUVOTON_NCT6791D_COM_A))
-		/* Route COM A to GPIO8 pin group */
-		pnp_write_config(dev, 0x2a, 0x00);
-
 	pnp_set_logical_device(dev);
 	pnp_set_enable(dev, 0);
 	pnp_set_iobase(dev, PNP_IDX_IO0, iobase);