diff --git a/src/utils.js b/src/utils.js
index 743d370..78d2dbd 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -15,14 +15,12 @@ for (const [key, value] of Object.entries(instances)) {
   const netId = Number(key.substring(5))
   for (const [currency, { instanceAddress, symbol, decimals }] of Object.entries(value)) {
     Object.entries(instanceAddress).forEach(([amount, address]) =>
-      addressMap.set(`${netId}_${address}`,
-        {
-          currency,
-          amount,
-          symbol,
-          decimals,
-        },
-      ),
+      addressMap.set(`${netId}_${address}`, {
+        currency,
+        amount,
+        symbol,
+        decimals,
+      }),
     )
   }
 }
diff --git a/test/validator.js b/test/validator.js
index 9d5cf93..420d79c 100644
--- a/test/validator.js
+++ b/test/validator.js
@@ -19,7 +19,13 @@ describe('Validator', () => {
         '.proof should match pattern "^0x[a-fA-F0-9]{512}$"',
       )
     })
-
+    it('should throw if unknown contract', () => {
+      const malformedData = { ...withdrawData }
+      malformedData.contract = '0xf17f52151ebef6c7334fad080c5704d77216b732'
+      getTornadoWithdrawInputError(malformedData).should.be.equal(
+        '.contract should pass "isKnownContract" keyword validation',
+      )
+    })
     it('should throw something is missing', () => {
       const malformedData = { ...withdrawData }
       delete malformedData.proof