diff --git a/sql/item_sum.cc b/sql/item_sum.cc
index e3524083354..ca6f17d486a 100644
--- a/sql/item_sum.cc
+++ b/sql/item_sum.cc
@@ -194,6 +194,7 @@ Item_sum_hybrid::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
   decimals=item->decimals;
   maybe_null=item->maybe_null;
   unsigned_flag=item->unsigned_flag;
+  set_charset(item->charset());
   result_field=0;
   null_value=1;
   fix_length_and_dec();