diff --git a/dns/rfc2136/Makefile b/dns/rfc2136/Makefile
index 13df9955f..37d29c8e9 100644
--- a/dns/rfc2136/Makefile
+++ b/dns/rfc2136/Makefile
@@ -1,6 +1,6 @@
 PLUGIN_NAME=		rfc2136
 PLUGIN_VERSION=		1.9
-PLUGIN_REVISION=	3
+PLUGIN_REVISION=	4
 PLUGIN_COMMENT=		RFC-2136 Support
 PLUGIN_MAINTAINER=	franco@opnsense.org
 PLUGIN_DEPENDS=		bind-tools
diff --git a/dns/rfc2136/src/etc/inc/plugins.inc.d/rfc2136.inc b/dns/rfc2136/src/etc/inc/plugins.inc.d/rfc2136.inc
index 349f07dde..bf346cd29 100644
--- a/dns/rfc2136/src/etc/inc/plugins.inc.d/rfc2136.inc
+++ b/dns/rfc2136/src/etc/inc/plugins.inc.d/rfc2136.inc
@@ -222,7 +222,7 @@ function get_rfc2136_ip_address($int, $ipver = 4)
         return 'down';
     }
 
-    if ($ipver != 6 && is_private_ip($ip_address)) {
+    if ($ipver != 6 && is_private_ipv4($ip_address)) {
         $ip_ch = curl_init('http://checkip.dyndns.org');
         curl_setopt($ip_ch, CURLOPT_RETURNTRANSFER, 1);
         curl_setopt($ip_ch, CURLOPT_INTERFACE, $ip_address);