diff --git a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
index 3e0d2d6d5802..f9707c3485ec 100644
--- a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
+++ b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
@@ -67,6 +67,7 @@ if (current_toolchain == default_toolchain) {
       "__config",
       "__debug",
       "__errc",
+      "__format/format_error.h",
       "__function_like.h",
       "__functional_03",
       "__functional_base",