diff --git a/lib/galaxy/model/unittest_utils/data_app.py b/lib/galaxy/model/unittest_utils/data_app.py
index fa92af3190a..75e5101eca8 100644
--- a/lib/galaxy/model/unittest_utils/data_app.py
+++ b/lib/galaxy/model/unittest_utils/data_app.py
@@ -61,6 +61,7 @@ class GalaxyDataTestConfig(Bunch):
         self.object_store = "disk"
         self.object_store_check_old_style = False
         self.object_store_cache_path = "/tmp/cache"
+        self.object_store_cache_size = -1
         self.object_store_store_by = "uuid"
 
         self.umask = os.umask(0o77)
diff --git a/lib/galaxy/objectstore/__init__.py b/lib/galaxy/objectstore/__init__.py
index 724fcc3e626..4a4d639bf92 100644
--- a/lib/galaxy/objectstore/__init__.py
+++ b/lib/galaxy/objectstore/__init__.py
@@ -1726,6 +1726,7 @@ def config_to_dict(config):
         "jobs_directory": config.jobs_directory,
         "new_file_path": config.new_file_path,
         "object_store_cache_path": config.object_store_cache_path,
+        "object_store_cache_size": config.object_store_cache_size,
         "gid": config.gid,
     }