diff --git a/openmptcprouter/files/etc/init.d/openmptcprouter-vps b/openmptcprouter/files/etc/init.d/openmptcprouter-vps
index f563e7918..409dafe52 100755
--- a/openmptcprouter/files/etc/init.d/openmptcprouter-vps
+++ b/openmptcprouter/files/etc/init.d/openmptcprouter-vps
@@ -527,7 +527,7 @@ _set_config_from_vps() {
 		set iperf.${servername}.udp=1
 		set iperf.${servername}.user=$iperf_user
 		set iperf.${servername}.password=$iperf_pass
-		set iperf.${servername}.key=$iperf_key
+		set iperf.${servername}.key="$iperf_key"
 		commit iperf
 	EOF