diff --git a/activejob/CHANGELOG.md b/activejob/CHANGELOG.md
index 4ff01094f5c..7a6abd8d308 100644
--- a/activejob/CHANGELOG.md
+++ b/activejob/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Do not trigger immediate loading of `ActiveJob::Base` when loading `ActiveJob::TestHelper`.
+
+    *Maxime Réty*
+
 *   Preserve the serialized timezone when deserializing `ActiveSupport::TimeWithZone` arguments.
 
     *Joshua Young*
diff --git a/activejob/lib/active_job/test_helper.rb b/activejob/lib/active_job/test_helper.rb
index 8b556a9cf6c..e4f376944c5 100644
--- a/activejob/lib/active_job/test_helper.rb
+++ b/activejob/lib/active_job/test_helper.rb
@@ -34,7 +34,9 @@ module ActiveJob
       end
     end
 
-    ActiveJob::Base.include(TestQueueAdapter)
+    ActiveSupport.on_load(:active_job) do
+      ActiveJob::Base.include(TestQueueAdapter)
+    end
 
     def before_setup # :nodoc:
       test_adapter = queue_adapter_for_test