diff --git a/module/models/protagonist.mjs b/module/models/protagonist.mjs
index c4242a1..a420825 100644
--- a/module/models/protagonist.mjs
+++ b/module/models/protagonist.mjs
@@ -90,7 +90,7 @@ export default class CthulhuEternalProtagonist extends foundry.abstract.TypeData
     let unnatural = this.parent.items.find(i => i.type === "skill" && i.name.toLowerCase() === game.i18n.localize("CTHULHUETERNAL.Skill.Unnatural").toLowerCase())
     let minus = 0
     if (unnatural) {
-      minus = unnatural.data.skillTotal
+      minus = unnatural.system.skillTotal
     }
     let maxSan = Math.max(99 - minus, 0)
     if ( this.san.max !== maxSan) {