diff --git a/config/initializers/100-oj.rb b/config/initializers/100-oj.rb
index 0936beaa79e..57991081c22 100644
--- a/config/initializers/100-oj.rb
+++ b/config/initializers/100-oj.rb
@@ -3,6 +3,7 @@
 Oj::Rails.set_encoder()
 Oj::Rails.set_decoder()
 Oj::Rails.optimize()
+Oj.default_options = Oj.default_options.merge(mode: :compat)
 
 # Not sure why it's not using this by default!
 MultiJson.engine = :oj