diff --git a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
index 4b8b088cd75fc..d8f7e16c230a0 100644
--- a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
+++ b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
@@ -818,6 +818,7 @@ if (current_toolchain == default_toolchain) {
       "__type_traits/is_trivially_copyable.h",
       "__type_traits/is_trivially_default_constructible.h",
       "__type_traits/is_trivially_destructible.h",
+      "__type_traits/is_trivially_lexicographically_comparable.h",
       "__type_traits/is_trivially_move_assignable.h",
       "__type_traits/is_trivially_move_constructible.h",
       "__type_traits/is_unbounded_array.h",