diff --git a/packages/common/test/hardforks.spec.ts b/packages/common/test/hardforks.spec.ts
index 029cc9f3ec..62039de0a3 100644
--- a/packages/common/test/hardforks.spec.ts
+++ b/packages/common/test/hardforks.spec.ts
@@ -433,6 +433,7 @@ tape('[Common]: Hardfork logic', function (t: tape.Test) {
     const json = require(`../../blockchain/test/testdata/geth-genesis-kiln.json`)
     c = Common.fromGethGenesis(json, {
       chain: 'kiln',
+      mergeForkIdPostMerge: false,
     })
 
     // MergeForkIdTransition change should be before Merge