diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index 8c64483..36d8dad 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -443,6 +443,11 @@
     Res.push_back(Opts.Sysroot);
   }
 
+  for (unsigned i = 0, e = Opts.CXXSystemIncludes.size(); i != e; ++i) {
+    Res.push_back("-cxx-system-include");
+    Res.push_back(Opts.CXXSystemIncludes[i]);
+  }
+
   /// User specified include entries.
   for (unsigned i = 0, e = Opts.UserEntries.size(); i != e; ++i) {
     const HeaderSearchOptions::Entry &E = Opts.UserEntries[i];
@@ -1143,6 +1148,7 @@
 
 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
   using namespace cc1options;
+  Opts.CXXSystemIncludes = Args.getAllArgValues(OPT_cxx_system_include);
   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
   Opts.Verbose = Args.hasArg(OPT_v);
   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);