diff --git a/lib/modules/gasEstimator/index.js b/lib/modules/gasEstimator/index.js
index dee093de..62ff637c 100644
--- a/lib/modules/gasEstimator/index.js
+++ b/lib/modules/gasEstimator/index.js
@@ -25,21 +25,18 @@ class GasEstimator {
           if (abiMethod.type === "constructor") {
             // already provided for us
             gasMap['constructor'] = contract.gasEstimates.creation.totalCost.toString();
-            gasCb(null);
+            gasCb();
           } else if (abiMethod.type === "fallback") {
             gasMap['fallback'] = contract.gasEstimates.external[""].toString();
-            gasCb(null);
+            gasCb();
           } else if (abiMethod.inputs === null || abiMethod.inputs === undefined || abiMethod.inputs.length === 0) {
             // just run it and register it
             contractObj.methods[name]
             .apply(contractObj.methods[name], [])
             .estimateGas((err, gasAmount) => {
-              if (err) {
-                return gasCb(err);
-              } else {
-                gasMap[name] = gasAmount;
-                gasCb(null, gasAmount, name);
-              }              
+              if (err) return gasCb(err);
+              gasMap[name] = gasAmount;
+              gasCb();              
             });
           } else {
             // async concatenate all the fuzz values and their gas cost outputs and check for equality