diff --git a/src/mfm.cpp b/src/mfm.cpp
index 800b2eb3..97c474b1 100644
--- a/src/mfm.cpp
+++ b/src/mfm.cpp
@@ -13,7 +13,11 @@ _setup_argparser_dup(CLI::App       &app_,
 
   subcmd = app_.add_subcommand("dup",
                                "duplicate files");
-  subcmd->add_option("dirpath",opts_.dirpath);
+  subcmd->add_option("path",opts_.dirpath)
+    ->description("")
+    ->type_name("PATH")
+    ->check(CLI::ExistingPath)
+    ->required();
 }
 
 static