diff --git a/lib/granblue/importers/base_importer.rb b/lib/granblue/importers/base_importer.rb
index 3cb1de5..7ad91a2 100644
--- a/lib/granblue/importers/base_importer.rb
+++ b/lib/granblue/importers/base_importer.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require_relative 'import_error'
+require 'csv'
 
 module Granblue
   module Importers