diff --git a/neutron/agent/securitygroups_rpc.py b/neutron/agent/securitygroups_rpc.py
index 01a3a2ab260..9b0d5797fb7 100644
--- a/neutron/agent/securitygroups_rpc.py
+++ b/neutron/agent/securitygroups_rpc.py
@@ -157,7 +157,7 @@ class SecurityGroupAgentRpcMixin(object):
             self.context, device_ids)
         with self.firewall.defer_apply():
             for device in devices.values():
-                LOG.debug(_("Update port filter for %s"), device)
+                LOG.debug(_("Update port filter for %s"), device['device'])
                 self.firewall.update_port_filter(device)