diff --git a/src/selectPlacementsAttributePersistence.ts b/src/selectPlacementsAttributePersistence.ts
index 3d3ccf6..84f0aba 100644
--- a/src/selectPlacementsAttributePersistence.ts
+++ b/src/selectPlacementsAttributePersistence.ts
@@ -12,6 +12,7 @@ const SELECT_PLACEMENTS_ATTRIBUTE_PERSISTENCE_DENY_LIST = [
   'couponcode',
   'currency',
   'language',
+  'passbackconversiontrackingid',
   'paymentserviceprovider',
   'paymentserviceproviderattribute',
   'paymenttype',
diff --git a/test/src/tests.spec.ts b/test/src/tests.spec.ts
index 338c70e..1944755 100644
--- a/test/src/tests.spec.ts
+++ b/test/src/tests.spec.ts
@@ -5809,6 +5809,8 @@ describe('Rokt Forwarder', () => {
       expect(isSelectPlacementsAttributePersistenceDenied('paymentServiceProvider')).toBe(true);
       expect(isSelectPlacementsAttributePersistenceDenied('cartItems')).toBe(true);
       expect(isSelectPlacementsAttributePersistenceDenied('conversionType')).toBe(true);
+      expect(isSelectPlacementsAttributePersistenceDenied('passbackconversiontrackingid')).toBe(true);
+      expect(isSelectPlacementsAttributePersistenceDenied('passbackConversionTrackingId')).toBe(true);
     });
 
     it('should return false for attributes that are not denylisted', () => {