diff --git a/extras/vpnupgrade.sh b/extras/vpnupgrade.sh
index ce572e2..d81db03 100644
--- a/extras/vpnupgrade.sh
+++ b/extras/vpnupgrade.sh
@@ -33,6 +33,11 @@ if ! printf '%s' "$os_type" | head -n 1 | grep -qiF -e ubuntu -e debian -e raspb
   exit 1
 fi
 
+debian_ver=$(sed 's/\..*//' /etc/debian_version)
+if [ "$debian_ver" = "8" ]; then
+  exiterr "Debian 8 is not supported."
+fi
+
 if [ -f /proc/user_beancounters ]; then
   exiterr "OpenVZ VPS is not supported."
 fi
diff --git a/vpnsetup.sh b/vpnsetup.sh
index a42c0cd..87906fd 100755
--- a/vpnsetup.sh
+++ b/vpnsetup.sh
@@ -60,7 +60,11 @@ if ! printf '%s' "$os_type" | head -n 1 | grep -qiF -e ubuntu -e debian -e raspb
   exit 1
 fi
 
-if [ "$(sed 's/\..*//' /etc/debian_version)" = "10" ] && [ ! -e /dev/ppp ]; then
+debian_ver=$(sed 's/\..*//' /etc/debian_version)
+if [ "$debian_ver" = "8" ]; then
+  exiterr "Debian 8 is not supported."
+fi
+if [ "$debian_ver" = "10" ] && [ ! -e /dev/ppp ]; then
   exiterr "/dev/ppp is missing. Debian 10 users, see: https://git.io/vpndebian10"
 fi