diff --git a/lib/refrepo/input_loader.rb b/lib/refrepo/input_loader.rb
index 86e71abc1adc1c7576e4648d3f2e791a8e5080e7..844ee3fe3b4aff485725b4f8c406cac861efd36f 100644
--- a/lib/refrepo/input_loader.rb
+++ b/lib/refrepo/input_loader.rb
@@ -1,6 +1,7 @@
 # Load a hierarchy of YAML file into a Ruby hash
 
 require 'refrepo/hash/hash'
+require 'refrepo/gen/reference-api'
 
 def load_yaml_file_hierarchy(directory = File.expand_path("../../input/grid5000/", File.dirname(__FILE__)))