1 files changed, 5 insertions, 4 deletions
diff --git a/packages/contracts/src/utils/log_decoder.ts b/packages/contracts/src/utils/log_decoder.ts
index 32819b657..07d10e69d 100644
--- a/packages/contracts/src/utils/log_decoder.ts
+++ b/packages/contracts/src/utils/log_decoder.ts
@@ -1,13 +1,14 @@
 import { ContractArtifact } from '@0xproject/sol-compiler';
+import { AbiDecoder, BigNumber } from '@0xproject/utils';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import {
     AbiDefinition,
+    DecodedLogArgs,
     LogEntry,
     LogWithDecodedArgs,
     RawLog,
     TransactionReceiptWithDecodedLogs,
-} from '@0xproject/types';
-import { AbiDecoder, BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
+} from 'ethereum-types';
 import * as _ from 'lodash';
 
 import { artifacts } from './artifacts';
@@ -36,7 +37,7 @@ export class LogDecoder {
         });
         this._abiDecoder = new AbiDecoder(abiArrays);
     }
-    public decodeLogOrThrow<ArgsType>(log: LogEntry): LogWithDecodedArgs<ArgsType> | RawLog {
+    public decodeLogOrThrow<ArgsType extends DecodedLogArgs>(log: LogEntry): LogWithDecodedArgs<ArgsType> | RawLog {
         const logWithDecodedArgsOrLog = this._abiDecoder.tryToDecodeLogOrNoop(log);
         if (_.isUndefined((logWithDecodedArgsOrLog as LogWithDecodedArgs<ArgsType>).args)) {
             throw new Error(`Unable to decode log: ${JSON.stringify(log)}`);