diff --git a/paddle/operators/scatter.h b/paddle/operators/scatter.h
index 714c022c02d15fc4c2a22c44747273c17fc5a63d..6b542675c291607b35f180123cf42fee6a783a85 100644
--- a/paddle/operators/scatter.h
+++ b/paddle/operators/scatter.h
@@ -75,12 +75,12 @@ void ScatterUpdate(const platform::Place& place,
   auto dst_dims = output->dims();
 
   // check src shape and dst shape should match
-  for (size_t i = 1; i < src_dims.size(); i++)
+  for (int i = 1; i < src_dims.size(); i++)
     PADDLE_ENFORCE(src_dims[i] == dst_dims[i]);
 
   // slice size
   size_t slice_size = 1;
-  for (size_t i = 0; i < src_dims.size(); ++i) slice_size *= src_dims[i];
+  for (int i = 0; i < src_dims.size(); ++i) slice_size *= src_dims[i];
 
   if (platform::is_cpu_place(place)) {
     CPUScatterUpdate<T>(src, index->data<int>(), index_size, output);