diff --git a/lib/cmdlib.py b/lib/cmdlib.py
index c751b2c00b5b5e486856b978e4d2f52a1c471d24..9159d9d179821e92ebbaa860d04f9c643e9be6d3 100644
--- a/lib/cmdlib.py
+++ b/lib/cmdlib.py
@@ -2147,7 +2147,7 @@ class LUFailoverInstance(LogicalUnit):
     if not rpc.call_instance_start(target_node, instance, None):
       _ShutdownInstanceDisks(instance, self.cfg)
       raise errors.OpExecError("Could not start instance %s on node %s." %
-                               (instance, target_node))
+                               (instance.name, target_node))
 
 
 def _CreateBlockDevOnPrimary(cfg, node, device):