diff --git a/openup b/openup
index 9d90ee5..8b74d73 100755
--- a/openup
+++ b/openup
@@ -37,7 +37,7 @@ VUXML_URL="https://stable.mtier.org/vuxml/$(uname -r | tr -d '.').xml"
 ########################################################################
 
 
-_OPENUP_VERSION=11
+_OPENUP_VERSION=12
 _OPENUP_MINREL=53
 
 usage() {
@@ -230,6 +230,18 @@ check_vuxml() {
 	done | fmt | sed '/^$/d'
 }
 
+do_i_need_to_reboot() {
+	# XXX hardcoded PKG_DBDIR
+	local kern_bp_time=$(stat -f "%Um" /var/db/pkg/binpatch${_REL_INT}-${_ARCH}-kernel-*)
+	local wake_up=$(sysctl -n kern.boottime)
+
+	if [ "${wake_up}" -lt "${kern_bp_time}" ]; then
+		pr_error
+		pr_error "System must be rebooted after the last kernel update"
+		pr_error
+	fi
+}
+
 while getopts 'KScn' arg; do
 	case ${arg} in
 	K)	exclude_kernel=1 ;;
@@ -258,4 +270,6 @@ else
 	update_pkg
 fi
 
+do_i_need_to_reboot
+
 rm -f ${_TMPDIR}/.openup-*