diff --git a/src/mainboard/google/brox/variants/caboc/variant.c b/src/mainboard/google/brox/variants/caboc/variant.c
index 666e370008..3142e8005d 100644
--- a/src/mainboard/google/brox/variants/caboc/variant.c
+++ b/src/mainboard/google/brox/variants/caboc/variant.c
@@ -21,5 +21,5 @@ const char *get_wifi_sar_cbfs_filename(void)
 
 const char *variant_get_auxfw_version_file(void)
 {
-	return NULL;
+	return "rts5453vb_GOOG0L01.hash";
 }