diff --git a/lib/que/scheduler/version_support.rb b/lib/que/scheduler/version_support.rb
index 152e0932..94816a2e 100644
--- a/lib/que/scheduler/version_support.rb
+++ b/lib/que/scheduler/version_support.rb
@@ -33,7 +33,7 @@ def apply_retry_semantics(context)
 
         def job_attributes(enqueued_job)
           if zero_major?
-            enqueued_job.attrs.transform_keys(&:to_sym)
+            enqueued_job.attrs.to_h.transform_keys(&:to_sym)
           else
             enqueued_job.que_attrs.transform_keys(&:to_sym).tap do |hash|
               hash[:job_id] = hash.delete(:id)