diff --git a/lib/octokit/client.rb b/lib/octokit/client.rb
index <HASH>..<HASH> 100644
--- a/lib/octokit/client.rb
+++ b/lib/octokit/client.rb
@@ -19,7 +19,7 @@ require 'octokit/client/users'
 
 module Octokit
   class Client
-    attr_accessor *Configuration::VALID_OPTIONS_KEYS
+    attr_accessor(*Configuration::VALID_OPTIONS_KEYS)
 
     def initialize(options={})
       options = Octokit.options.merge(options)
diff --git a/lib/octokit/configuration.rb b/lib/octokit/configuration.rb
index <HASH>..<HASH> 100644
--- a/lib/octokit/configuration.rb
+++ b/lib/octokit/configuration.rb
@@ -22,7 +22,7 @@ module Octokit
     DEFAULT_OAUTH_TOKEN = nil
     DEFAULT_USER_AGENT  = "Octokit Ruby Gem #{Octokit::VERSION}".freeze
 
-    attr_accessor *VALID_OPTIONS_KEYS
+    attr_accessor(*VALID_OPTIONS_KEYS)
 
     def self.extended(base)
       base.reset
Avoid the following ruby warnings:

    .../lib/octokit/configuration.rb:<I>: warning: `*' interpreted as argument prefix
    .../lib/octokit/client.rb:<I>: warning: `*' interpreted as argument prefix

(by helping out the ruby interpreter with some parentheses)