--- a/tests/src/xcm/xcmUnique.test.ts
+++ b/tests/src/xcm/xcmUnique.test.ts
@@ -1293,7 +1293,7 @@
       const unitsPerSecond = 1n;
       const numAssetsWeightHint = 0;
 
-      if((await helper.assetManager.assetTypeId(uniqueAssetLocation)).toJSON) {
+      if((await helper.assetManager.assetTypeId(uniqueAssetLocation)).toJSON()) {
         console.log('Unique asset is already registered on MoonBeam');
       } else {
         const encodedProposal = helper.assetManager.makeRegisterForeignAssetProposal({