diff --git a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
index 4a7105f825323..c698338792e22 100644
--- a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
+++ b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
@@ -1021,6 +1021,7 @@ if (current_toolchain == default_toolchain) {
       "locale.h",
       "map",
       "math.h",
+      "mdspan",
       "memory",
       "memory_resource",
       "mutex",
@@ -1039,6 +1040,7 @@ if (current_toolchain == default_toolchain) {
       "semaphore",
       "set",
       "shared_mutex",
+      "source_location",
       "span",
       "sstream",
       "stack",
@@ -1049,11 +1051,13 @@ if (current_toolchain == default_toolchain) {
       "stdint.h",
       "stdio.h",
       "stdlib.h",
+      "stop_token",
       "streambuf",
       "string",
       "string.h",
       "string_view",
       "strstream",
+      "syncstream",
       "system_error",
       "tgmath.h",
       "thread",