diff --git a/cmd/oras/manifest/delete.go b/cmd/oras/manifest/delete.go
index ce49a0188..00f11f57b 100644
--- a/cmd/oras/manifest/delete.go
+++ b/cmd/oras/manifest/delete.go
@@ -71,6 +71,7 @@ Example - Delete a manifest by digest 'sha256:99e4703fbf30916f549cd6bfa9cdbab614
 		},
 	}
 
+	opts.EnableDistributionSpecFlag()
 	option.ApplyFlags(&opts, cmd.Flags())
 	return cmd
 }