diff --git a/paddle/framework/ddim.cc b/paddle/framework/ddim.cc
index 0e2cd3acc8b5931ef9c7c654e504be29df170013..58e20625ce7a3d71e4fc59dc5478539eecd6b88c 100644
--- a/paddle/framework/ddim.cc
+++ b/paddle/framework/ddim.cc
@@ -288,14 +288,11 @@ DDim::DDim(std::initializer_list<int64_t> init_list) {
 // will be the product of tensor's first `num_col_dims` dimensions
 DDim flatten_to_2d(const DDim& src, int num_col_dims) {
   int rank = src.size();
-  return make_ddim(
-      {static_cast<int>(product(slice_ddim(src, 0, num_col_dims))),
-       static_cast<int>(product(slice_ddim(src, num_col_dims, rank)))});
+  return make_ddim({product(slice_ddim(src, 0, num_col_dims)),
+                    product(slice_ddim(src, num_col_dims, rank))});
 }
 
-DDim flatten_to_1d(const DDim& src) {
-  return make_ddim({static_cast<int>(product(src))});
-}
+DDim flatten_to_1d(const DDim& src) { return make_ddim({product(src)}); }
 
 }  // namespace framework
 }  // namespace paddle