diff --git a/mediagoblin/media_types/audio/processing.py b/mediagoblin/media_types/audio/processing.py
index 8348f843..62daf412 100644
--- a/mediagoblin/media_types/audio/processing.py
+++ b/mediagoblin/media_types/audio/processing.py
@@ -126,3 +126,6 @@ def process_audio(entry):
     mgg.queue_store.delete_file(queued_filepath)
 
     entry.save()
+
+    # clean up workbench
+    workbench.destroy_self()