From 0c112a2a1c1811e1fc7c4b03881f960b952c788c Mon Sep 17 00:00:00 2001
From: Leonid Logvinov <logvinov.leon@gmail.com>
Date: Fri, 6 Oct 2017 15:13:31 +0300
Subject: Add a hex prefix

---
 src/utils/filter_utils.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/utils')

diff --git a/src/utils/filter_utils.ts b/src/utils/filter_utils.ts
index c056467c7..e09a95a6e 100644
--- a/src/utils/filter_utils.ts
+++ b/src/utils/filter_utils.ts
@@ -16,7 +16,7 @@ export const filterUtils = {
               subscriptionOpts?: SubscriptionOpts): Web3.FilterObject {
         const eventAbi = _.find(abi, {name: eventName}) as Web3.EventAbi;
         const eventSignature = filterUtils.getEventSignatureFromAbiByName(eventAbi, eventName);
-        const topicForEventSignature = jsSHA3.keccak256(eventSignature);
+        const topicForEventSignature = ethUtil.addHexPrefix(jsSHA3.keccak256(eventSignature));
         const topicsForIndexedArgs = filterUtils.getTopicsForIndexedArgs(eventAbi, indexFilterValues);
         const topics = [topicForEventSignature, ...topicsForIndexedArgs];
         let filter: Web3.FilterObject = {
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