diff --git a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
index e0ddd12b28e183..2d25ce8ae8ba2f 100644
--- a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
+++ b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
@@ -299,6 +299,7 @@ if (current_toolchain == default_toolchain) {
       "__iterator/next.h",
       "__iterator/ostream_iterator.h",
       "__iterator/ostreambuf_iterator.h",
+      "__iterator/permutable.h",
       "__iterator/prev.h",
       "__iterator/projected.h",
       "__iterator/readable_traits.h",