diff --git a/mozilla/config/system-headers b/mozilla/config/system-headers
index 93fa0f88d36..c40e1dcae15 100644
--- a/mozilla/config/system-headers
+++ b/mozilla/config/system-headers
@@ -300,6 +300,7 @@ kernel/image.h
 kernel/OS.h
 key.h
 keyt.h
+keythi.h
 LAction.h
 langinfo.h
 LApplication.h