diff --git a/activejob/lib/active_job/queue_name.rb b/activejob/lib/active_job/queue_name.rb
index de259261de..a718397db4 100644
--- a/activejob/lib/active_job/queue_name.rb
+++ b/activejob/lib/active_job/queue_name.rb
@@ -49,7 +49,7 @@ module ActiveJob
       def queue_name_from_part(part_name) #:nodoc:
         queue_name = part_name || default_queue_name
         name_parts = [queue_name_prefix.presence, queue_name]
-        name_parts.compact.join(queue_name_delimiter)
+        -name_parts.compact.join(queue_name_delimiter)
       end
     end