diff --git a/scripts/gnt-cluster b/scripts/gnt-cluster
index 55b46a1700f1dbefe6a2ee6cdba4ecb256bcfdc3..31e64259c6afbd2a07085f1727c3994064ca4deb 100755
--- a/scripts/gnt-cluster
+++ b/scripts/gnt-cluster
@@ -236,7 +236,7 @@ def VerifyDisks(opts, args):
   """
   op = opcodes.OpVerifyDisks()
   result = SubmitOpCode(op)
-  if not isinstance(result, tuple) or len(result) != 4:
+  if not isinstance(result, (list, tuple)) or len(result) != 4:
     raise errors.ProgrammerError("Unknown result type for OpVerifyDisks")
 
   nodes, nlvm, instances, missing = result