diff --git a/middleman-core/lib/middleman-core/extensions/directory_indexes.rb b/middleman-core/lib/middleman-core/extensions/directory_indexes.rb
index 36cb3c3f..78822ebd 100644
--- a/middleman-core/lib/middleman-core/extensions/directory_indexes.rb
+++ b/middleman-core/lib/middleman-core/extensions/directory_indexes.rb
@@ -46,9 +46,9 @@ module Middleman::Extensions
             next
           end
           
-          resource.destination_path = resource.path.chomp(File.extname(index_file)) + new_index_path
+          resource.destination_path = resource.destination_path.chomp(File.extname(index_file)) + new_index_path
         end
       end
     end
   end
-end
\ No newline at end of file
+end