diff --git a/src/mainboard/google/brya/Kconfig.name b/src/mainboard/google/brya/Kconfig.name
index e2a917c337..7209e368a3 100644
--- a/src/mainboard/google/brya/Kconfig.name
+++ b/src/mainboard/google/brya/Kconfig.name
@@ -219,6 +219,7 @@ config BOARD_GOOGLE_OSIRIS
 config BOARD_GOOGLE_MITHRAX
 	bool "->  Mithrax"
 	select BOARD_GOOGLE_BASEBOARD_BRYA
+	select CHROMEOS_WIFI_SAR if CHROMEOS
 	select DRIVERS_GENERIC_GPIO_KEYS
 	select DRIVERS_GENESYSLOGIC_GL9755
 
diff --git a/src/mainboard/google/brya/variants/mithrax/Makefile.inc b/src/mainboard/google/brya/variants/mithrax/Makefile.inc
index 1d149fd80a..2e359d3e2d 100644
--- a/src/mainboard/google/brya/variants/mithrax/Makefile.inc
+++ b/src/mainboard/google/brya/variants/mithrax/Makefile.inc
@@ -1,3 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
 bootblock-y += gpio.c
 ramstage-y += gpio.c
+
+ramstage-$(CONFIG_FW_CONFIG) += variant.c
diff --git a/src/mainboard/google/brya/variants/mithrax/variant.c b/src/mainboard/google/brya/variants/mithrax/variant.c
index 2af5a9a976..b0bf99ac56 100644
--- a/src/mainboard/google/brya/variants/mithrax/variant.c
+++ b/src/mainboard/google/brya/variants/mithrax/variant.c
@@ -3,6 +3,12 @@
 #include <chip.h>
 #include <fw_config.h>
 #include <baseboard/variants.h>
+#include <sar.h>
+
+const char *get_wifi_sar_cbfs_filename(void)
+{
+	return "wifi_sar_0.hex";
+}
 
 void variant_update_soc_chip_config(struct soc_intel_alderlake_config *config)
 {