diff --git a/llvm/utils/gn/secondary/clang/lib/Headers/BUILD.gn b/llvm/utils/gn/secondary/clang/lib/Headers/BUILD.gn
index 7860c2fe7c86e861d9ee16ce384dfc68c16a9ee4..cb95753f7e02bc398af691a9f033cbe88ec6bc57 100644
--- a/llvm/utils/gn/secondary/clang/lib/Headers/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang/lib/Headers/BUILD.gn
@@ -105,6 +105,7 @@ copy("Headers") {
     "avxintrin.h",
     "bmi2intrin.h",
     "bmiintrin.h",
+    "cet.h",
     "cetintrin.h",
     "cldemoteintrin.h",
     "clflushoptintrin.h",