diff --git a/lib/mpw/config.rb b/lib/mpw/config.rb
index be99f31..915e603 100644
--- a/lib/mpw/config.rb
+++ b/lib/mpw/config.rb
@@ -65,7 +65,7 @@ class Config
                        length:  16,
                      }
 
-    ['numeric', 'special', 'alpha', 'length'].each do |k|
+    %w(numeric special alpha length).each do |k|
       if options.key?("pwd_#{k}".to_sym)
         password[k.to_sym] = options["pwd_#{k}".to_sym]
       elsif !@password.nil? && @password.key?(k.to_sym)