diff --git a/lib/galaxy/app_unittest_utils/galaxy_mock.py b/lib/galaxy/app_unittest_utils/galaxy_mock.py
index 117873b2c128..1c937a4db2e7 100644
--- a/lib/galaxy/app_unittest_utils/galaxy_mock.py
+++ b/lib/galaxy/app_unittest_utils/galaxy_mock.py
@@ -110,6 +110,7 @@ def __init__(self, config=None, **kwargs):
         self.interactivetool_manager = Bunch(create_interactivetool=lambda *args, **kwargs: None)
         self.is_job_handler = False
         self.biotools_metadata_source = None
+        self.display_builtin_converters = True
         set_thread_app(self)
 
         def url_for(*args, **kwds):