diff --git a/src/vulkan/runtime/bvh/vk_bvh.h b/src/vulkan/runtime/bvh/vk_bvh.h
index b18505409a3..53afd3ddf43 100644
--- a/src/vulkan/runtime/bvh/vk_bvh.h
+++ b/src/vulkan/runtime/bvh/vk_bvh.h
@@ -102,6 +102,8 @@ struct vk_ir_header {
     * uses a separate memory section for leaf nodes.
     */
    uint32_t dst_leaf_node_offset;
+   /* Additional fields for the driver to use during encode. */
+   uint32_t driver_internal[6];
 };
 
 struct vk_ir_node {