diff --git a/lib/liquid/tags/if.rb b/lib/liquid/tags/if.rb
index c376f6c..1202d58 100644
--- a/lib/liquid/tags/if.rb
+++ b/lib/liquid/tags/if.rb
@@ -19,6 +19,10 @@ module Liquid
       super
     end
 
+    def nodelist
+      @blocks.map(&:attachment).flatten
+    end
+
     def unknown_tag(tag, markup, tokens)
       if ['elsif', 'else'].include?(tag)
         push_block(tag, markup)