diff --git a/lib/mailjet/resource.rb b/lib/mailjet/resource.rb
index c99b44e..f4af366 100644
--- a/lib/mailjet/resource.rb
+++ b/lib/mailjet/resource.rb
@@ -3,6 +3,7 @@
 require 'active_support'
 require 'active_support/core_ext/string'
 require 'active_support/core_ext/hash/indifferent_access'
+require 'active_support/core_ext/object/blank'