diff --git a/openvpn-install.sh b/openvpn-install.sh
index 2de24c8..121a782 100644
--- a/openvpn-install.sh
+++ b/openvpn-install.sh
@@ -539,8 +539,8 @@ WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
 	rm -f ~/EasyRSA-3.0.4.tgz
 	cd /etc/openvpn/easy-rsa/ || return
 	# Generate a random, alphanumeric identifier of 16 characters for CN and one for server name
-	SERVER_CN="cn_$(tr -dc 'a-zA-Z0-9' < /dev/urandom | fold -w 16 | head -n 1)"
-	SERVER_NAME="server_$(tr -dc 'a-zA-Z0-9' < /dev/urandom | fold -w 16 | head -n 1)"
+	SERVER_CN="cn_$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
+	SERVER_NAME="server_$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
 	echo "set_var EASYRSA_KEY_SIZE $RSA_KEY_SIZE" > vars
 	echo "set_var EASYRSA_REQ_CN $SERVER_CN" >> vars
 	# Create the PKI, set up the CA, the DH params and the server + client certificates