diff --git a/src/module/feats/shareWeakness.js b/src/module/feats/shareWeakness.js
index 23c22e64..80527fff 100644
--- a/src/module/feats/shareWeakness.js
+++ b/src/module/feats/shareWeakness.js
@@ -1,4 +1,4 @@
-import { MORTAL_WEAKNESS_EFFECT_UUID } from "../utils/index.js";
+import { MORTAL_WEAKNESS_COMPENDIUM_SOURCE } from "../utils/index.js";
 import { getActorEVEffect } from "../utils/helpers.js";
 import { applySWEffect } from "../socket.js";
 //Share Weakness macro
@@ -13,8 +13,8 @@ function shareWeakness() {
   }
   const sa = a[0].actor;
   const hasShareWeakness = sa.items.some((i) => i.slug === "share-weakness");
-  const hasMortalWeaknessActive = sa.items.some(
-    (i) => i._stats.compendiumSource === MORTAL_WEAKNESS_EFFECT_UUID
+  const hasMortalWeaknessActive = sa.itemTypes.effect.some(
+    (i) => i._stats.compendiumSource === MORTAL_WEAKNESS_COMPENDIUM_SOURCE
   );
   const EVEffect = getActorEVEffect(sa).find(
     (i) => i.slug === "exploit-mortal-weakness"
diff --git a/src/module/utils/index.js b/src/module/utils/index.js
index 3bb3109e..9a58ab71 100644
--- a/src/module/utils/index.js
+++ b/src/module/utils/index.js
@@ -2,6 +2,7 @@ const EXPLOIT_VULNERABILITY_ACTION_ID =
   "Compendium.pf2e.actionspf2e.Item.fodJ3zuwQsYnBbtk";
 const MORTAL_WEAKNESS_EFFECT_UUID =
   "Compendium.pf2e-thaum-vuln.thaumaturge-effects.Item.N0jy0FFGS7ViTvs9";
+const MORTAL_WEAKNESS_COMPENDIUM_SOURCE = "Item.plf15q5mFglgWG8w";
 const PERSONAL_ANTITHESIS_EFFECT_UUID =
   "Compendium.pf2e-thaum-vuln.thaumaturge-effects.Item.EGY7Rxcxwv1aEyHL";
 const OFF_GUARD_EFFECT_UUID =
@@ -82,6 +83,7 @@ export {
   SupportedActions,
   EXPLOIT_VULNERABILITY_ACTION_ID,
   MORTAL_WEAKNESS_EFFECT_UUID,
+  MORTAL_WEAKNESS_COMPENDIUM_SOURCE,
   PERSONAL_ANTITHESIS_EFFECT_UUID,
   OFF_GUARD_EFFECT_UUID,
   MORTAL_WEAKNESS_TARGET_UUID,