diff --git a/source/behavior/spawn_rules/components/mob_event_filter.json b/source/behavior/spawn_rules/components/mob_event_filter.json
index eff62bae..ba6889f4 100644
--- a/source/behavior/spawn_rules/components/mob_event_filter.json
+++ b/source/behavior/spawn_rules/components/mob_event_filter.json
@@ -4,5 +4,6 @@
   "description": "UNDOCUMENTED",
   "$comment": "UNDOCUMENTED",
   "additionalProperties": false,
+  "type": "object",
   "properties": { "event": { "type": "string", "description": "UNDOCUMENTED", "$comment": "UNDOCUMENTED", "title": "Event" } }
 }