diff --git a/test/models/webchat_test.rb b/test/models/webchat_test.rb
index d87b09c7d..924cc821d 100644
--- a/test/models/webchat_test.rb
+++ b/test/models/webchat_test.rb
@@ -1,4 +1,5 @@
 require "test_helper"
+require "active_model"
 
 class WebchatTest < ActiveSupport::TestCase
   webchat_config = {