diff --git a/scripts/gnt-node b/scripts/gnt-node
index 418f02cb5c65864bd166c337ab2ec0a2916355a0..564c125b2b24746ea628433039d85bccc828fc95 100755
--- a/scripts/gnt-node
+++ b/scripts/gnt-node
@@ -676,7 +676,7 @@ commands = {
     [ArgNode(min=1, max=1),
      ArgChoice(min=1, max=1, choices=_MODIFIABLE_STORAGE_TYPES),
      ArgFile(min=1, max=1)],
-    [],
+    [ALLOCATABLE_OPT],
     "<node_name> <storage_type> <name>", "Modify storage volume on a node"),
   'repair-volume': (
     RepairVolume,