diff --git a/chroot_version_hooks.d/19_sudo_90_cros b/chroot_version_hooks.d/19_sudo_90_cros
index 7f664d54c2..4a9352a0b1 100644
--- a/chroot_version_hooks.d/19_sudo_90_cros
+++ b/chroot_version_hooks.d/19_sudo_90_cros
@@ -11,7 +11,7 @@ if [ ! -e ${frag} ]; then
   tmp=$(mktemp 2>/dev/null || echo /tmp/17_upgrade_hook.$$)
   cat <<EOF > "${tmp}" || exit 1
 Defaults env_keep += CROS_WORKON_SRCROOT
-Defaults env_keep += CHROMEOS_OFFICIAL
+Defaults env_keep += COREOS_OFFICIAL
 Defaults env_keep += PORTAGE_USERNAME
 Defaults env_keep += http_proxy
 Defaults env_keep += ftp_proxy
diff --git a/sdk_lib/enter_chroot.sh b/sdk_lib/enter_chroot.sh
index d4d421be44..3bb46733ea 100755
--- a/sdk_lib/enter_chroot.sh
+++ b/sdk_lib/enter_chroot.sh
@@ -28,7 +28,7 @@ DEFINE_string chrome_root_mount "/home/${SUDO_USER}/chrome_root" \
 DEFINE_string cache_dir "" "Directory to use for caching."
 
 DEFINE_boolean official_build $FLAGS_FALSE \
-  "Set CHROMEOS_OFFICIAL=1 for release builds."
+  "Set COREOS_OFFICIAL=1 for release builds."
 DEFINE_boolean ssh_agent $FLAGS_TRUE "Import ssh agent."
 DEFINE_boolean early_make_chroot $FLAGS_FALSE \
   "Internal flag.  If set, the command is run as root without sudo."
@@ -66,7 +66,7 @@ FLAGS "$@" || exit 1
 eval set -- "${FLAGS_ARGV}"
 
 if [ $FLAGS_official_build -eq $FLAGS_TRUE ]; then
-   CHROMEOS_OFFICIAL=1
+   COREOS_OFFICIAL=1
 fi
 
 [ -z "${FLAGS_cache_dir}" ] && \