diff --git a/assets/testnet/genesis.json b/assets/testnet/genesis.json
index 2a539d768c..70af8cf7ff 100755
--- a/assets/testnet/genesis.json
+++ b/assets/testnet/genesis.json
@@ -18,6 +18,7 @@
     "mergeNetsplitBlock": 0,
     "bedrockBlock": 0,
     "regolithTime": 0,
+    "preContractForkBlock": 5114294,
     "terminalTotalDifficulty": 0,
     "terminalTotalDifficultyPassed": true,
     "optimism": {