diff --git a/lib/cmds/blockchain/blockchain.js b/lib/cmds/blockchain/blockchain.js
index 352caecb..66adcffe 100644
--- a/lib/cmds/blockchain/blockchain.js
+++ b/lib/cmds/blockchain/blockchain.js
@@ -38,7 +38,9 @@ var Blockchain = function(options) {
     wsOrigins: this.blockchainConfig.wsOrigins || false,
     wsApi: (this.blockchainConfig.wsApi || ['eth', 'web3', 'net', 'shh']),
     vmdebug: this.blockchainConfig.vmdebug || false,
-    targetGasLimit: this.blockchainConfig.targetGasLimit || false
+    targetGasLimit: this.blockchainConfig.targetGasLimit || false,
+    light: this.blockchainConfig.light || false,
+    fast: this.blockchainConfig.fast || false
   };
 
   if (this.blockchainConfig === {} || JSON.stringify(this.blockchainConfig) === '{"enabled":true}') {