diff --git a/src/lib/cbfs.c b/src/lib/cbfs.c
index 1e8a93f6e0..9ac1bc084b 100644
--- a/src/lib/cbfs.c
+++ b/src/lib/cbfs.c
@@ -302,7 +302,7 @@ static int cbfs_master_header_props(struct cbfs_props *props)
 	if (rdev_readat(bdev, &rel_offset, offset, sizeof(int32_t)) < 0)
 		return -1;
 
-	offset = fmap_top + rel_offset;
+	offset = fmap_top + (int32_t)le32_to_cpu(rel_offset);
 	if (rdev_readat(bdev, &header, offset, sizeof(header)) < 0)
 		return -1;