diff --git a/wireguard-install.sh b/wireguard-install.sh
index db81d84..27535aa 100644
--- a/wireguard-install.sh
+++ b/wireguard-install.sh
@@ -282,7 +282,7 @@ PostDown = ip6tables -t nat -D POSTROUTING -o ${SERVER_PUB_NIC} -j MASQUERADE" >
 	echo "net.ipv4.ip_forward = 1
 net.ipv6.conf.all.forwarding = 1" >/etc/sysctl.d/wg.conf
 
-	if [[ ${OS} = 'alpine' ]]; then
+	if [[ ${OS} == 'alpine' ]]; then
 		sysctl -p /etc/sysctl.d/wg.conf
 		rc-update add sysctl
 		ln -s /etc/init.d/wg-quick "/etc/init.d/wg-quick.${SERVER_WG_NIC}"