diff --git a/src/mesa/state_tracker/st_cb_rasterpos.c b/src/mesa/state_tracker/st_cb_rasterpos.c
index fecaaf77da8..c54b50dc754 100644
--- a/src/mesa/state_tracker/st_cb_rasterpos.c
+++ b/src/mesa/state_tracker/st_cb_rasterpos.c
@@ -208,6 +208,10 @@ new_draw_rastpos_stage(struct gl_context *ctx, struct draw_context *draw)
    rs->prim.end = 1;
    rs->prim.start = 0;
    rs->prim.count = 1;
+   rs->prim.pad = 0;
+   rs->prim.num_instances = 1;
+   rs->prim.base_instance = 0;
+   rs->prim.is_indirect = 0;
 
    return rs;
 }