diff --git a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
index 1e54043a0c50..e95192b6b989 100644
--- a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
+++ b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
@@ -347,6 +347,7 @@ if (current_toolchain == default_toolchain) {
       "__memory/allocator.h",
       "__memory/allocator_arg_t.h",
       "__memory/allocator_traits.h",
+      "__memory/assume_aligned.h",
       "__memory/auto_ptr.h",
       "__memory/compressed_pair.h",
       "__memory/concepts.h",