diff --git a/openmptcprouter/files/etc/uci-defaults/1930-omr-shadowsocks b/openmptcprouter/files/etc/uci-defaults/1930-omr-shadowsocks
index ae9faeec9..3ea9e6957 100755
--- a/openmptcprouter/files/etc/uci-defaults/1930-omr-shadowsocks
+++ b/openmptcprouter/files/etc/uci-defaults/1930-omr-shadowsocks
@@ -33,5 +33,11 @@ if [ "$(uci -q get shadowsocks-libev.hi.timeout)" != "600" ]; then
 		EOF
 	done
 fi
+if [ "$(uci -q get shadowsocks-libev.sss0.method)" != "chacha20" ]; then
+	uci -q batch <<-EOF > /dev/null
+		set shadowsocks-libev.sss0.method=chacha20
+		commit shadowsocks-libev
+	EOF
+fi
 rm -f /tmp/luci-indexcache
 exit 0