diff --git a/helpers/voting/makePriceRequestsByKey.ts b/helpers/voting/makePriceRequestsByKey.ts
index 337db5c3..d1730cd8 100644
--- a/helpers/voting/makePriceRequestsByKey.ts
+++ b/helpers/voting/makePriceRequestsByKey.ts
@@ -32,10 +32,9 @@ function formatPriceRequests(priceRequests: RawPriceRequestDataT[]) {
 function formatPriceRequest(
   priceRequest: RawPriceRequestDataT
 ): PriceRequestT & VoteParticipationT & VoteResultsT {
-  const time =
-    priceRequest.time instanceof BigNumber
-      ? priceRequest.time.toNumber()
-      : priceRequest.time;
+  const time = BigNumber.isBigNumber(priceRequest.time)
+    ? priceRequest.time.toNumber()
+    : priceRequest.time;
   const timeMilliseconds = time * 1000;
   const timeAsDate = new Date(timeMilliseconds);
   const identifier = priceRequest.identifier;
diff --git a/helpers/voting/makeUniqueKeyForVote.ts b/helpers/voting/makeUniqueKeyForVote.ts
index f414045e..a548cdc8 100644
--- a/helpers/voting/makeUniqueKeyForVote.ts
+++ b/helpers/voting/makeUniqueKeyForVote.ts
@@ -1,4 +1,4 @@
-import { BigNumber } from "ethers";
+import { BigNumber, utils } from "ethers";
 
 export function makeUniqueKeyForVote(
   decodedIdentifier: string,
@@ -8,5 +8,6 @@ export function makeUniqueKeyForVote(
   if (typeof time !== "number") {
     time = time.toNumber();
   }
-  return `${decodedIdentifier}-${time}-${ancillaryData}`;
+  const ancillaryDataHash = utils.keccak256(utils.toUtf8Bytes(ancillaryData));
+  return `${decodedIdentifier}-${time}-${ancillaryDataHash}`;
 }