diff --git a/src/gallium/include/pipe/p_state.h b/src/gallium/include/pipe/p_state.h
index b00cbff046a..54dc20f2a70 100644
--- a/src/gallium/include/pipe/p_state.h
+++ b/src/gallium/include/pipe/p_state.h
@@ -53,6 +53,7 @@
 extern "C" {
 #endif
 
+struct gl_buffer_object;
 
 /**
  * Implementation limits
@@ -778,6 +779,7 @@ struct pipe_draw_info
     */
    union {
       struct pipe_resource *resource;  /**< real buffer */
+      struct gl_buffer_object *gl_bo; /**< for the GL frontend, not passed to drivers */
       const void *user;  /**< pointer to a user buffer */
    } index;