diff --git a/_data/chains/eip155-43114.json b/_data/chains/eip155-43114.json
index 898a3c4a..2610b371 100644
--- a/_data/chains/eip155-43114.json
+++ b/_data/chains/eip155-43114.json
@@ -2,6 +2,7 @@
   "name": "Avalanche C-Chain",
   "chain": "AVAX",
   "rpc": ["https://api.avax.network/ext/bc/C/rpc"],
+  "features": [{ "name": "EIP1559" }],
   "faucets": ["https://free-online-app.com/faucet-for-eth-evm-chains/"],
   "nativeCurrency": {
     "name": "Avalanche",