diff --git a/ckan/lib/dictization/model_dictize.py b/ckan/lib/dictization/model_dictize.py
index 0ee6b9ae5b9..2483b46a252 100644
--- a/ckan/lib/dictization/model_dictize.py
+++ b/ckan/lib/dictization/model_dictize.py
@@ -78,7 +78,6 @@ def extras_list_dictize(extras_list, context):
 
 def resource_dictize(res, context):
     resource = table_dictize(res, context)
-    resource['format'] = resource.get('format').lower() if resource.get('format') else ''
     extras = resource.pop("extras", None)
     if extras:
         resource.update(extras)