diff --git a/src/utils/hex.test.ts b/src/utils/hex.test.ts
index 07a145e..83714eb 100644
--- a/src/utils/hex.test.ts
+++ b/src/utils/hex.test.ts
@@ -11,13 +11,13 @@ describe('Utils hex', () => {
 
   it('converts a string to a hex string', () => {
     const stringInput = '456';
-    const expectedHex = '0x01c8';
+    const expectedHex = '0x1c8';
     expect(toHex(stringInput)).toBe(expectedHex);
   });
 
   it('converts a BigNumber to a hex string', () => {
     const bigNumberInput = BigNumber.from(789);
-    const expectedHex = '0x0315';
+    const expectedHex = '0x315';
     expect(toHex(bigNumberInput)).toBe(expectedHex);
   });
 });
diff --git a/src/utils/hex.ts b/src/utils/hex.ts
index a8a86e4..30737a6 100644
--- a/src/utils/hex.ts
+++ b/src/utils/hex.ts
@@ -1,4 +1,6 @@
 import { BigNumber } from '@ethersproject/bignumber';
+import { hexValue } from '@ethersproject/bytes';
 
-export const toHex = (stringToConvert: string | number | BigNumber): string =>
-  BigNumber.from(stringToConvert).toHexString();
+export const toHex = (stringToConvert: string | number | BigNumber): string => {
+  return hexValue(BigNumber.from(stringToConvert).toHexString());
+};