diff --git a/net/openconnect/files/openconnect.sh b/net/openconnect/files/openconnect.sh
index 30513f6b4..307e3a758 100755
--- a/net/openconnect/files/openconnect.sh
+++ b/net/openconnect/files/openconnect.sh
@@ -38,10 +38,10 @@ proto_openconnect_setup() {
 
 	cmdline="$server$port -i vpn-$config --non-inter --syslog --script /lib/netifd/vpnc-script"
 
-	[ -f /etc/openconnect/ca-vpn-$config.pem ] && append cmdline "--cafile /etc/openconnect/ca-vpn-$config.pem"
+	[ -f /etc/openconnect/ca-vpn-$config.pem ] && append cmdline "--no-system-trust --cafile /etc/openconnect/ca-vpn-$config.pem"
 	[ -f /etc/openconnect/user-cert-vpn-$config.pem ] && append cmdline "-c /etc/openconnect/user-cert-vpn-$config.pem"
 	[ -f /etc/openconnect/user-key-vpn-$config.pem ] && append cmdline "--sslkey /etc/openconnect/user-key-vpn-$config.pem"
-	[ -n "$serverhash" ] && append cmdline "--servercert=$serverhash"
+	[ -n "$serverhash" ] && append cmdline "--no-system-trust --servercert=$serverhash"
 	[ -n "$authgroup" ] && append cmdline "--authgroup $authgroup"
 	[ -n "$username" ] && append cmdline "-u $username"
 	[ -n "$password" ] && {