diff --git a/lib/config/blockchain.js b/lib/config/blockchain.js
index a6856a21e..1cc9dd82b 100644
--- a/lib/config/blockchain.js
+++ b/lib/config/blockchain.js
@@ -38,6 +38,7 @@ BlockchainConfig.prototype.config = function(env) {
     gasLimit: config.gas_limit || 500000,
     gasPrice: config.gas_price || 10000000000000,
     rpcWhitelist: config.rpc_whitelist,
+    nat: config.nat,
     mine: config.mine,
     minerthreads: config.minerthreads,
     genesisBlock: config.genesis_block,