diff --git a/lib/contracts.js b/lib/contracts.js
index 0efb3c37a..f66dfcdc9 100644
--- a/lib/contracts.js
+++ b/lib/contracts.js
@@ -19,7 +19,7 @@ ContractsManager.prototype.compileContracts = function() {
 ContractsManager.prototype.build = function() {
   for(var className in this.compiledContracts) {
     var contract = this.compiledContracts[className];
-    var contractConfig = this.contractsConfig[className];
+    var contractConfig = this.contractsConfig.contracts[className];
 
     if (this.contractsConfig.gas === 'auto') {
       var maxGas = Math.max(contract.gasEstimates.creation[0], contract.gasEstimates.creation[1], 500000);