diff --git a/plugin.py b/plugin.py
index eb0e99d..9a58e85 100644
--- a/plugin.py
+++ b/plugin.py
@@ -243,7 +243,7 @@ def vmrrd(cubeid):
     """ retrieve rrd graphs (PNG) """
     slave_name, vm_type, vm_id = grid.query_vm(cubeid)
     proxobject = auth(slave_name)
-    object.cluster.status.get()[0]['name']
+    proxobject.cluster.status.get()[0]['name']
     ioconfig.logger.info('slave[%s]> query rrd of %s %s' % (slave_name, vm_type, vm_id))
 
     result = {}