diff --git a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
index 2eae476bc5ee4..efd9bd83e773c 100644
--- a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
+++ b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
@@ -164,6 +164,13 @@ if (current_toolchain == default_toolchain) {
       "__charconv/chars_format.h",
       "__charconv/from_chars_result.h",
       "__charconv/to_chars_result.h",
+      "__chrono/calendar.h",
+      "__chrono/duration.h",
+      "__chrono/file_clock.h",
+      "__chrono/high_resolution_clock.h",
+      "__chrono/steady_clock.h",
+      "__chrono/system_clock.h",
+      "__chrono/time_point.h",
       "__compare/common_comparison_category.h",
       "__compare/compare_three_way.h",
       "__compare/compare_three_way_result.h",