diff --git a/db_scripts/diff/13833.up b/db_scripts/diff/13833.up
index 20f5a656..04a5cf0a 100644
--- a/db_scripts/diff/13833.up
+++ b/db_scripts/diff/13833.up
@@ -5,5 +5,5 @@ ALTER TABLE voip_intercept
   ADD COLUMN `sip_username` varchar(255) DEFAULT NULL,
   ADD COLUMN `sip_domain` varchar(255) DEFAULT NULL,
   ADD COLUMN `cc_delivery_host` varchar(64) DEFAULT NULL,
-  ADD COLUMN `cc_delivery_port` smallint(5) DEFAULT NULL;
+  ADD COLUMN `cc_delivery_port` smallint(5) UNSIGNED DEFAULT NULL;