diff --git a/storage/innobase/dict/dict0inst.cc b/storage/innobase/dict/dict0inst.cc
index f54e335811a..ff0a770d16c 100644
--- a/storage/innobase/dict/dict0inst.cc
+++ b/storage/innobase/dict/dict0inst.cc
@@ -96,6 +96,8 @@ bool Instant_ddl_impl<Table>::is_instant_add_drop_possible(
       dummy_col.set_mbminmaxlen(mbminlen, mbmaxlen);
       dict_field_t dummy_field;
       dummy_field.col = &dummy_col;
+      dummy_field.fixed_len = static_cast<unsigned int>(
+          dummy_col.get_fixed_size(dict_table_is_comp(dict_table)));
       get_field_max_size(dict_table, index, &dummy_field, field_max_size);
     }