diff --git a/lib/jekyll/configuration.rb b/lib/jekyll/configuration.rb
index 575dca65..087fdf78 100644
--- a/lib/jekyll/configuration.rb
+++ b/lib/jekyll/configuration.rb
@@ -164,8 +164,7 @@ module Jekyll
         config_files = Jekyll.sanitized_path(source(override), "_config.#{default}")
         @default_config_file = true
       end
-      config_files = [config_files] unless config_files.is_a? Array
-      config_files
+      Array(config_files)
     end
 
     # Public: Read configuration and return merged Hash