diff --git a/sql/sql_lex.cc b/sql/sql_lex.cc
index fd9367b99f2..e171cf1c06d 100644
--- a/sql/sql_lex.cc
+++ b/sql/sql_lex.cc
@@ -1616,6 +1616,7 @@ void st_select_lex::init_query()
   ref_pointer_array= 0;
   select_n_where_fields= 0;
   select_n_having_items= 0;
+  n_child_sum_items= 0;
   subquery_in_having= explicit_limit= 0;
   is_item_list_lookup= 0;
   first_execution= 1;