diff --git a/instrumentation/active_job/lib/opentelemetry/instrumentation/active_job/instrumentation.rb b/instrumentation/active_job/lib/opentelemetry/instrumentation/active_job/instrumentation.rb
index d4f5dfe3c..a5b9d22e0 100644
--- a/instrumentation/active_job/lib/opentelemetry/instrumentation/active_job/instrumentation.rb
+++ b/instrumentation/active_job/lib/opentelemetry/instrumentation/active_job/instrumentation.rb
@@ -71,7 +71,7 @@ def require_dependencies
         def patch_activejob
           Handlers.subscribe
 
-          ActiveSupport.on_load(:active_job) do
+          ::ActiveSupport.on_load(:active_job) do
             ::ActiveJob::Base.prepend(Patches::Base) unless ::ActiveJob::Base <= Patches::Base
           end
         end