diff --git a/etc/rc.d/jail b/etc/rc.d/jail
index 0718fa8..87d97fe 100755
--- a/etc/rc.d/jail
+++ b/etc/rc.d/jail
@@ -588,9 +588,17 @@ jail_start()
 			echo -n " [${_hostname} already running (/var/run/jail_${_jail}.id exists)]"
 			continue;
 		fi
+		_ip4arg=""
+		_ip6arg=""
 		_addrl=""
 		_addr6l=""
 		jail_ips "add"
+		if [ -n "${_addrl}" ]; then
+			_ip4arg="ip4.addr=\"${_addrl}\""
+		fi
+		if [ -n "${_addr6l}" ]; then
+			_ip6arg="ip6.addr=\"${_addr6l}\""
+		fi
 		if [ -n "${_fib}" ]; then
 			_setfib="setfib -F '${_fib}'"
 		else
@@ -656,7 +664,7 @@ jail_start()
 		done
 
 		eval ${_setfib} jail -n ${_jail} ${_flags} -i -c path=${_rootdir} host.hostname=${_hostname} \
-			ip4.addr=\"${_addrl}\" ip6.addr=\"${_addr6l}\" ${_parameters} command=${_exec_start} > ${_tmp_jail} 2>&1 \
+			${_ip4arg} ${_ip6arg} ${_parameters} command=${_exec_start} > ${_tmp_jail} 2>&1 \
 			</dev/null
 
 		if [ "$?" -eq 0 ] ; then