diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 2354bd494e66..5bc8830765d5 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -1064,8 +1064,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
                     options::OPT_fno_diagnostics_fixit_info))
     CmdArgs.push_back("-fno-diagnostics-fixit-info");
 
-  if (Args.hasArg(options::OPT_fdiagnostics_binary))
-    CmdArgs.push_back("-fdiagnostics-binary");
+  Args.AddLastArg(CmdArgs, options::OPT_fdiagnostics_binary);
 
   // Enable -fdiagnostics-show-option by default.
   if (Args.hasFlag(options::OPT_fdiagnostics_show_option,