diff --git a/sql/item_sum.cc b/sql/item_sum.cc
index dc616da9d48..4d84b609f46 100644
--- a/sql/item_sum.cc
+++ b/sql/item_sum.cc
@@ -3543,7 +3543,7 @@ Item_sum_str::fix_fields(THD *thd, Item **ref)
     /* We should ignore FIELD's in arguments to sum functions */
     with_flags|= (args[i]->with_flags & ~item_with_t::FIELD);
 	if (args[i]->check_type_can_return_str(
-                   Item_func_group_concat::func_name_cstring()))
+                 func_name_cstring()))
       return true;
   }