diff --git a/lib/modules/fuzzer/index.js b/lib/modules/fuzzer/index.js
index 13dd52e84..02defe933 100644
--- a/lib/modules/fuzzer/index.js
+++ b/lib/modules/fuzzer/index.js
@@ -22,11 +22,11 @@ class ContractFuzzer {
       fuzzMap[name] = {};
       for (let i = 0; i < iterations; i++) {
         fuzzMap[name][i] = inputTypes.map(input => this.getTypeFuzz(input));
-        self.logger.info(name);
-        self.logger.info("iteration: " + i + "\n" + fuzzMap[name][i]);
+        self.logger.trace(name);
+        self.logger.trace("iteration: " + i + "\n" + fuzzMap[name][i]);
       }
     });
-    self.logger.info('\n');
+    self.logger.trace('\n');
     return fuzzMap;
   }
 
diff --git a/lib/modules/gasEstimator/index.js b/lib/modules/gasEstimator/index.js
index b897ffcff..dee093de6 100644
--- a/lib/modules/gasEstimator/index.js
+++ b/lib/modules/gasEstimator/index.js
@@ -46,7 +46,7 @@ class GasEstimator {
             async.concat(fuzzMap[name], (values, getVarianceCb) => {
               contractObj.methods[name].apply(contractObj.methods[name], values)
                 .estimateGas((err, gasAmount) => {
-                  getVarianceCb(err, [gasAmount]);
+                  getVarianceCb(err, gasAmount);
                 });
               }, (err, variance) => {
                 if (err) {