diff --git a/src/mfm.cpp b/src/mfm.cpp
index a6282468..19aac30f 100644
--- a/src/mfm.cpp
+++ b/src/mfm.cpp
@@ -19,7 +19,9 @@ _setup_argparser_dup(CLI::App       &app_,
     ->check(CLI::ExistingPath)
     ->required();
 
-  subcmd->callback(std::bind(mfm::dup,std::cref(opts_)));
+  auto func = std::bind(mfm::dup,std::cref(opts_));
+
+  subcmd->callback(func);
 }
 
 static