diff --git a/objects/ip-port/definition.json b/objects/ip-port/definition.json
index 9054eee..67c8ce7 100644
--- a/objects/ip-port/definition.json
+++ b/objects/ip-port/definition.json
@@ -80,6 +80,7 @@
       ],
       "description": "Source port",
       "misp-attribute": "port",
+      "multiple": true,
       "ui-priority": 0
     },
     "text": {