diff --git a/instrumentation/active_job/lib/opentelemetry/instrumentation/active_job/handlers.rb b/instrumentation/active_job/lib/opentelemetry/instrumentation/active_job/handlers.rb
index 9c14f65e1..c1061ed71 100644
--- a/instrumentation/active_job/lib/opentelemetry/instrumentation/active_job/handlers.rb
+++ b/instrumentation/active_job/lib/opentelemetry/instrumentation/active_job/handlers.rb
@@ -57,7 +57,7 @@ def subscribe
           }
 
           @subscriptions = handlers_by_pattern.map do |key, handler|
-            ActiveSupport::Notifications.subscribe("#{key}.active_job", handler)
+            ::ActiveSupport::Notifications.subscribe("#{key}.active_job", handler)
           end
         end
 
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 260f5fc45..c76427f6d 100644
--- a/instrumentation/active_job/lib/opentelemetry/instrumentation/active_job/instrumentation.rb
+++ b/instrumentation/active_job/lib/opentelemetry/instrumentation/active_job/instrumentation.rb
@@ -17,7 +17,7 @@ class Instrumentation < OpenTelemetry::Instrumentation::Base
         end
 
         present do
-          defined?(::ActiveJob)
+          defined?(::ActiveJob) && defined?(::ActiveSupport)
         end
 
         compatible do