diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index ec65655..d92cf40 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -1393,8 +1393,7 @@
   using namespace cc1options;
   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
   Opts.Verbose = Args.hasArg(OPT_v);
-  Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc) &&
-                            !Args.hasArg(OPT_fms_compatibility);
+  Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
   Opts.UseStandardIncludes = !Args.hasArg(OPT_nostdinc);
   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))