diff --git a/src/treelearner/split_info.hpp b/src/treelearner/split_info.hpp
index 234105eb9a34..8d33a6a76854 100644
--- a/src/treelearner/split_info.hpp
+++ b/src/treelearner/split_info.hpp
@@ -53,7 +53,7 @@ struct SplitInfo {
   bool default_left = true;
   int8_t monotone_type = 0;
   inline static int Size(int max_cat_threshold) {
-    return 2 * sizeof(int) + sizeof(uint32_t) + sizeof(bool) + sizeof(double) * 7 + sizeof(data_size_t) * 2 + max_cat_threshold * sizeof(uint32_t) + sizeof(int8_t);
+    return 2 * sizeof(int) + sizeof(uint32_t) + sizeof(bool) + sizeof(double) * 7 + sizeof(data_size_t) * 2 + max_cat_threshold * sizeof(uint32_t) + sizeof(int8_t) + sizeof(int64_t)*2;
   }
 
   inline void CopyTo(char* buffer) const {