diff --git a/include/clang/Driver/CC1Options.td b/include/clang/Driver/CC1Options.td
index f2aba0d..6938991 100644
--- a/include/clang/Driver/CC1Options.td
+++ b/include/clang/Driver/CC1Options.td
@@ -526,6 +526,8 @@
   HelpText<"Enable some traditional CPP emulation">;
 def ffake_address_space_map : Flag<"-ffake-address-space-map">,
   HelpText<"Use a fake address space map; OpenCL testing purposes only">;
+def funknown_anytype : Flag<"-funknown-anytype">,
+  HelpText<"Enable parser support for the __unknown_anytype type; for testing purposes only">;
 
 //===----------------------------------------------------------------------===//
 // Header Search Options