diff --git a/python/paddle/utils/code_gen/backward.yaml b/python/paddle/utils/code_gen/backward.yaml
index 81c211e6407353e8032be34d6d5fb9bca5ee0258..360425a30ccad6aaea94099544ae37b1a705f80c 100644
--- a/python/paddle/utils/code_gen/backward.yaml
+++ b/python/paddle/utils/code_gen/backward.yaml
@@ -229,6 +229,7 @@
   kernel :
     func : cast_grad
     data_type : out_grad
+  no_need_buffer : x
 
 - backward_api : ceil_grad
   forward : ceil(Tensor x) -> Tensor(out)