diff --git a/metropolis/cli/metroctl/cmd_node_approve.go b/metropolis/cli/metroctl/cmd_node_approve.go
index 62ab7bd..294f8c3 100644
--- a/metropolis/cli/metroctl/cmd_node_approve.go
+++ b/metropolis/cli/metroctl/cmd_node_approve.go
@@ -17,7 +17,7 @@
 var approveCmd = &cobra.Command{
 	Short: "Approves a candidate node, if specified; lists nodes pending approval otherwise.",
 	Use:   "approve [node-id]",
-	Args:  cobra.MaximumNArgs(1), // One positional argument: node ID
+	Args:  PrintUsageOnWrongArgs(cobra.MaximumNArgs(1)), // One positional argument: node ID
 	Run:   doApprove,
 }