diff --git a/src/mainboard/google/brya/variants/redrix/Makefile.inc b/src/mainboard/google/brya/variants/redrix/Makefile.inc
index f2a624c0e8..acf9bada81 100644
--- a/src/mainboard/google/brya/variants/redrix/Makefile.inc
+++ b/src/mainboard/google/brya/variants/redrix/Makefile.inc
@@ -4,3 +4,5 @@ bootblock-y += gpio.c
 ramstage-y += gpio.c
 
 ramstage-$(CONFIG_FW_CONFIG) += fw_config.c
+
+ramstage-y += variant.c
diff --git a/src/mainboard/google/brya/variants/redrix/variant.c b/src/mainboard/google/brya/variants/redrix/variant.c
new file mode 100644
index 0000000000..6a79780f6e
--- /dev/null
+++ b/src/mainboard/google/brya/variants/redrix/variant.c
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <sar.h>
+
+const char *get_wifi_sar_cbfs_filename(void)
+{
+	return "wifi_sar_0.hex";
+}