diff --git a/data/json/monster_factions.json b/data/json/monster_factions.json
index 82b85433d9cc8..4fa1687fbbf02 100644
--- a/data/json/monster_factions.json
+++ b/data/json/monster_factions.json
@@ -326,7 +326,8 @@
   {
     "type": "MONSTER_FACTION",
     "name": "pig",
-    "base_faction": "herbivore"
+    "base_faction": "herbivore",
+    "neutral": [ "herbivore" ]
   },
   {
     "type": "MONSTER_FACTION",