diff --git a/lib/jekyll.rb b/lib/jekyll.rb
index 16cedc68..9530b2d1 100644
--- a/lib/jekyll.rb
+++ b/lib/jekyll.rb
@@ -173,6 +173,7 @@ module Jekyll
 end
 
 require "jekyll/drops/drop"
+require "jekyll/drops/document_drop"
 require_all 'jekyll/commands'
 require_all 'jekyll/converters'
 require_all 'jekyll/converters/markdown'