diff --git a/cc/toolchains/llvm/cc_toolchain_config.bzl b/cc/toolchains/llvm/cc_toolchain_config.bzl
index 41d9da1..70f911f 100644
--- a/cc/toolchains/llvm/cc_toolchain_config.bzl
+++ b/cc/toolchains/llvm/cc_toolchain_config.bzl
@@ -27,6 +27,7 @@ def cc_toolchain_config(
         cxx_builtin_include_directories,
         tool_paths,
         target_system_name,
+        extra_copts = [],
         builtin_sysroot = None,
         is_darwin = False):
     if not is_target_triplet(host_system_name):
@@ -55,7 +56,7 @@ def cc_toolchain_config(
         "-Wall",
         "-Wthread-safety",
         "-Wself-assign",
-    ]
+    ] + extra_copts
 
     # -fstandalone-debug disables options that optimize
     # the size of the debug info.
diff --git a/cc/toolchains/llvm/x86_64-aarch64-linux/BUILD.bazel b/cc/toolchains/llvm/x86_64-aarch64-linux/BUILD.bazel
index e94273c..a0dd3be 100644
--- a/cc/toolchains/llvm/x86_64-aarch64-linux/BUILD.bazel
+++ b/cc/toolchains/llvm/x86_64-aarch64-linux/BUILD.bazel
@@ -125,6 +125,7 @@ cc_toolchain_config(
     },
     toolchain_identifier = "clang-x86_64-linux",
     toolchain_path_prefix = "external/x86_64-linux-llvm",
+    extra_copts = ["-mcpu=neoverse-n1"],
 )
 
 cc_toolchain(