diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index 31fcee2..9d9c996 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -574,6 +574,8 @@
     Res.push_back("-fcxx-exceptions");
   if (Opts.SjLjExceptions)
     Res.push_back("-fsjlj-exceptions");
+  if (Opts.TraditionalCPP)
+    Res.push_back("-traditional-cpp");
   if (!Opts.RTTI)
     Res.push_back("-fno-rtti");
   if (Opts.MSBitfields)
@@ -1442,6 +1444,7 @@
   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
+  Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
 
   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
   Opts.Blocks = Args.hasArg(OPT_fblocks);