diff --git a/nova/image/glance.py b/nova/image/glance.py
index 9282a1545e2..c306a6eef86 100644
--- a/nova/image/glance.py
+++ b/nova/image/glance.py
@@ -181,9 +181,9 @@ def _extract_query_params(self, params):
                 _params[param] = params.get(param)
 
         # ensure filters is a dict
-        params.setdefault('filters', {})
+        _params.setdefault('filters', {})
         # NOTE(vish): don't filter out private images
-        params['filters'].setdefault('is_public', 'none')
+        _params['filters'].setdefault('is_public', 'none')
 
         return _params