diff --git a/helpers.h b/helpers.h
index b580643..0cc1a17 100644
--- a/helpers.h
+++ b/helpers.h
@@ -14,6 +14,7 @@
 int drv_dumb_bo_create(struct bo *bo, uint32_t width, uint32_t height, uint32_t format,
 		       uint32_t flags);
 int drv_dumb_bo_destroy(struct bo *bo);
+int drv_map_info_destroy(struct bo *bo);
 int drv_gem_bo_destroy(struct bo *bo);
 int drv_prime_bo_import(struct bo *bo, struct drv_import_fd_data *data);
 void *drv_dumb_bo_map(struct bo *bo, struct map_info *data, size_t plane, int prot);