diff --git a/lld/MachO/Driver.cpp b/lld/MachO/Driver.cpp
--- a/lld/MachO/Driver.cpp
+++ b/lld/MachO/Driver.cpp
@@ -1142,10 +1142,8 @@
 
   config->mapFile = args.getLastArgValue(OPT_map);
   config->outputFile = args.getLastArgValue(OPT_o, "a.out");
-  if (const Arg *arg = args.getLastArg(OPT_final_output))
-    config->finalOutput = arg->getValue();
-  else
-    config->finalOutput = config->outputFile;
+  config->finalOutput =
+      args.getLastArgValue(OPT_final_output, config->outputFile);
   config->astPaths = args.getAllArgValues(OPT_add_ast_path);
   config->headerPad = args::getHex(args, OPT_headerpad, /*Default=*/32);
   config->headerPadMaxInstallNames =