diff --git a/lib/cmdlib.py b/lib/cmdlib.py
index 1f890a5dfaec80933be2aa93ebd49f1f2b03719f..6ce84133c03c5d3f467ef03bfab05dcfc9237004 100644
--- a/lib/cmdlib.py
+++ b/lib/cmdlib.py
@@ -3254,7 +3254,7 @@ class LUModifyNodeStorage(NoHooksLU):
   REQ_BGL = False
 
   def CheckArguments(self):
-    self.opnode_name = _ExpandNodeName(self.cfg, self.op.node_name)
+    self.op.node_name = _ExpandNodeName(self.cfg, self.op.node_name)
 
     _CheckStorageType(self.op.storage_type)