diff --git a/lib/google/apis/core/upload.rb b/lib/google/apis/core/upload.rb
index f02e8ddb0..d42fe4352 100644
--- a/lib/google/apis/core/upload.rb
+++ b/lib/google/apis/core/upload.rb
@@ -18,6 +18,7 @@ require 'google/apis/core/api_command'
 require 'google/apis/errors'
 require 'addressable/uri'
 require 'mime-types'
+require "tempfile"
 
 module Google
   module Apis