diff --git a/lib/qiniu/config.rb b/lib/qiniu/config.rb
index 7be3887..33d373b 100755
--- a/lib/qiniu/config.rb
+++ b/lib/qiniu/config.rb
@@ -34,7 +34,7 @@ module Qiniu
           :tmpdir          => Dir.tmpdir + File::SEPARATOR + 'QiniuRuby'
         }
 
-        REQUIRED_OPTION_KEYS = [:access_key, :secret_key]
+        REQUIRED_OPTION_KEYS = [:access_key, :secret_key, :up_host]
 
         attr_reader :settings, :default_params