diff --git a/ge/single_op/task/op_task.h b/ge/single_op/task/op_task.h
index 165b7a1c..248ccf97 100644
--- a/ge/single_op/task/op_task.h
+++ b/ge/single_op/task/op_task.h
@@ -268,7 +268,7 @@ private:
   std::string memcpy_so_name_;
   std::string memcpy_kernel_name_;
   // args size
-  size_t memcpy_args_size_ = 0;
+  uint32_t memcpy_args_size_ = 0;
 };
 
 class MemcpyAsyncTask : public OpTask {