diff --git a/lib/modules/fuzzer/index.js b/lib/modules/fuzzer/index.js
index 76ddd1f5..6e2fb524 100644
--- a/lib/modules/fuzzer/index.js
+++ b/lib/modules/fuzzer/index.js
@@ -82,7 +82,7 @@ class ContractFuzzer {
   }
 
   generateRandomInt(size) {
-    return utils.hexToNumber(utils.randomHex(size / 8));
+    return utils.toBN(utils.randomHex(size / 8));
   }
 
   generateRandomAddress() {