diff --git a/chroot_version_hooks.d/165_clean_libbrillo_so b/chroot_version_hooks.d/165_clean_libbrillo_so
new file mode 100644
index 0000000..9ce0982
--- /dev/null
+++ b/chroot_version_hooks.d/165_clean_libbrillo_so
@@ -0,0 +1,9 @@
+# Copyright 2019 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Some library and package config files of libbrillo were created at
+# src_install() phase into the cache. It prevents overwriting when we switch to
+# create those files at src_compile with the user priviledge.
+
+sudo rm -rf /var/cache/portage/* /build/*/var/cache/portage/*