diff --git a/app/models/quantity.rb b/app/models/quantity.rb
index ed81124..683c71c 100644
--- a/app/models/quantity.rb
+++ b/app/models/quantity.rb
@@ -66,7 +66,7 @@ class Quantity < ApplicationRecord
     self.model.with(numbered: numbered(:parent_id, :name)).with_recursive(arel_table.name => [
       numbered.project(
         numbered[Arel.star],
-        numbered.cast(numbered[:child_number], 'BINARY').as('path')
+        numbered.cast(numbered[:child_number], connection.adapter_name == 'Mysql2' ? 'BINARY' : 'BLOB').as('path')
       ).where(numbered[root && include_root ? :id : :parent_id].eq(root)),
       numbered.project(
         numbered[Arel.star],