diff --git a/include/clang/Driver/CC1Options.td b/include/clang/Driver/CC1Options.td
index 3b87dd2..3d59906 100644
--- a/include/clang/Driver/CC1Options.td
+++ b/include/clang/Driver/CC1Options.td
@@ -166,6 +166,8 @@
   HelpText<"Enable additional debug output">;
 def mdisable_fp_elim : Flag<"-mdisable-fp-elim">,
   HelpText<"Disable frame pointer elimination optimization">;
+def mdisable_tail_calls : Flag<"-mdisable-tail-calls">,
+  HelpText<"Disable tail call optimization, keeping the call stack accurate">;
 def menable_no_infinities : Flag<"-menable-no-infs">,
   HelpText<"Allow optimization to assume there are no infinities.">;
 def menable_no_nans : Flag<"-menable-no-nans">,