diff --git a/lib/galaxy/webapps/galaxy/api/workflows.py b/lib/galaxy/webapps/galaxy/api/workflows.py
index dd28c0af0c68..ac6a05d15852 100644
--- a/lib/galaxy/webapps/galaxy/api/workflows.py
+++ b/lib/galaxy/webapps/galaxy/api/workflows.py
@@ -1164,7 +1164,6 @@ def export_invocation_bco(self, trans, invocation_id, **kwd):
 
         galaxy_extension = []  # TODO
         input_subdomain = []  # TODO
-        output_subdomain = []  # TODO
 
         ret_dict = {
             'bco_id': url_for('invocation_export_bco', invocation_id=invocation_id, qualified=True),