diff --git a/app/presenters/api_docs/api_reference.rb b/app/presenters/api_docs/api_reference.rb
index 6c0225c5c66..1cca0c6af57 100644
--- a/app/presenters/api_docs/api_reference.rb
+++ b/app/presenters/api_docs/api_reference.rb
@@ -1,3 +1,5 @@
+require 'openapi3_parser'
+
 module APIDocs
   class APIReference
     include Rails.application.routes.url_helpers