diff --git a/module/data/actor/adversary.mjs b/module/data/actor/adversary.mjs
index 05659982..95efb436 100644
--- a/module/data/actor/adversary.mjs
+++ b/module/data/actor/adversary.mjs
@@ -191,6 +191,10 @@ export default class DhpAdversary extends DhCreature {
         }
     }
 
+    prepareDerivedData() {
+        this.attack.roll.isStandardAttack = true;
+    }
+
     _getTags() {
         const tags = [
             game.i18n.localize(`DAGGERHEART.GENERAL.Tiers.${this.tier}`),
@@ -406,10 +410,4 @@ export default class DhpAdversary extends DhCreature {
 
         return result;
     }
-
-    static migrateData(source) {
-        if (!source.attack.roll.isStandardAttack) source.attack.roll.isStandardAttack = true;
-
-        return super.migrateData(source);
-    }
 }
diff --git a/module/data/fields/action/rollField.mjs b/module/data/fields/action/rollField.mjs
index 0d6f746b..63d48990 100644
--- a/module/data/fields/action/rollField.mjs
+++ b/module/data/fields/action/rollField.mjs
@@ -11,11 +11,6 @@ export class DHActionRollData extends foundry.abstract.DataModel {
                 choices: CONFIG.DH.ACTOR.abilities,
                 label: 'DAGGERHEART.GENERAL.Trait.single'
             }),
-            isStandardAttack: new fields.BooleanField({
-                required: true,
-                nullable: false,
-                initial: false
-            }),
             difficulty: new fields.NumberField({ nullable: true, initial: null, integer: true, min: 0 }),
             bonus: new fields.NumberField({ nullable: true, initial: null, integer: true }),
             advState: new fields.StringField({