diff --git a/lib/searchkick/index.rb b/lib/searchkick/index.rb
index 9022c75..40e7ca8 100644
--- a/lib/searchkick/index.rb
+++ b/lib/searchkick/index.rb
@@ -97,8 +97,10 @@ module Searchkick
       if Searchkick.callbacks_value.nil?
         if defined?(Searchkick::ReindexV2Job)
           Searchkick::ReindexV2Job.perform_later(record.class.name, record.id.to_s)
-        else
+        elsif defined?(Delayed::Job)
           Delayed::Job.enqueue Searchkick::ReindexJob.new(record.class.name, record.id.to_s)
+        else
+          raise Searchkick::Error, "Job adapter not found"
         end
       else
         reindex_record(record)
--
libgit2 0.21.0