diff --git a/lib/contracts.js b/lib/contracts.js
index 8122eec27..73252b846 100644
--- a/lib/contracts.js
+++ b/lib/contracts.js
@@ -79,7 +79,7 @@ ContractsManager.prototype.build = function(done) {
         contract.abiDefinition    = compiledContract.abiDefinition;
 
         contract.gas = (contractConfig && contractConfig.gas) || self.contractsConfig.gas;
-        contract.gas = adjustGas(contract);
+        adjustGas(contract);
 
         contract.gasPrice = contract.gasPrice || self.contractsConfig.gasPrice;
         contract.type = 'file';