2 files changed, 3 insertions, 0 deletions
diff --git a/ydb/core/util/btree.h b/ydb/core/util/btree.h
index 96c99b4ebd6..2a7dbe3d9fe 100644
--- a/ydb/core/util/btree.h
+++ b/ydb/core/util/btree.h
@@ -11,6 +11,7 @@
 #include <util/system/yassert.h>
 
 #include <atomic>
+#include <cstddef>
 #include <vector>
 
 namespace NKikimr {
diff --git a/ydb/core/util/btree_common.h b/ydb/core/util/btree_common.h
index 541da739035..e56f26825a5 100644
--- a/ydb/core/util/btree_common.h
+++ b/ydb/core/util/btree_common.h
@@ -3,6 +3,8 @@
 #include <util/generic/ylimits.h>
 #include <util/system/compiler.h>
 
+#include <cstddef>
+
 namespace NKikimr {
 
     /**