diff --git a/usr/local/pkg/carp_settings.xml b/usr/local/pkg/carp_settings.xml
index 62791fc89a..d07d773235 100644
--- a/usr/local/pkg/carp_settings.xml
+++ b/usr/local/pkg/carp_settings.xml
@@ -117,13 +117,13 @@
 			<fieldname>synchronizelb</fieldname>
 			<description>When this option is enabled, this system will automatically sync the Load Balancer settings over to the other carp host when changes are made.</description>
 			<type>checkbox</type>
-		</field>			
+		</field>
 		<field>
 			<fielddescr>Synchronize Virtual IPs</fielddescr>
 			<fieldname>synchronizevirtualip</fieldname>
 			<description>When this option is enabled, this system will automatically sync the Virtual IP (minus proxyarp) settings over to the other carp host when changes are made.</description>
 			<type>checkbox</type>
-		</field>			
+		</field>
 		<field>
 			<fielddescr>Synchronize traffic shaper</fielddescr>
 			<fieldname>synchronizetrafficshaper</fieldname>
@@ -135,7 +135,7 @@
 			<fieldname>synchronizednsforwarder</fieldname>
 			<description>When this option is enabled, this system will automatically sync the DNS Forwarder hosts/domains over to the other carp host when changes are made.</description>
 			<type>checkbox</type>
-		</field>			
+		</field>
 		<field>
 			<fielddescr>Synchronize to IP</fielddescr>
 			<fieldname>synchronizetoip</fieldname>
@@ -150,11 +150,16 @@
                         <type>password</type>
                 </field>
 	</fields>
+	<custom_php_validation_command>
+		if($_POST["synchronizetoip"])
+			if(!is_ipaddr($_POST["synchronizetoip"]))
+				$input_errors[] = "You must specify a valid IP address.";
+	</custom_php_validation_command>
 	<custom_add_php_command_late>
 		/* setup carp interfaces */
 		interfaces_carp_configure();
 		interfaces_carp_bring_up_final();
 		/* force a filter configure for syncing */
 		filter_configure();
-	</custom_add_php_command_late>	
+	</custom_add_php_command_late>
 </packagegui>
\ No newline at end of file