diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index a865145ca..bb2ccba5c 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -5,6 +5,7 @@ require_relative 'coverage_helper'
 CoverageHelper.eager_load if ENV['COVERAGE']
 
 require "logstash/devutils/rspec/spec_helper"
+require "logstash/logging/json"
 
 class JSONIOThingy < IO
   def initialize; end