diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index 7622eb7..f0a9bf4 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -1173,7 +1173,7 @@
   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
          ie = Args.filtered_end(); it != ie; ++it)
     Opts.AddPath((*it)->getValue(Args), frontend::Quoted, true, false);
-  for (arg_iterator it = Args.filtered_begin(OPT_isystem),
+  for (arg_iterator it = Args.filtered_begin(OPT_isystem, OPT_iwithsysroot),
          ie = Args.filtered_end(); it != ie; ++it)
     Opts.AddPath((*it)->getValue(Args), frontend::System, true, false);