diff --git a/packages/types/CHANGELOG.md b/packages/types/CHANGELOG.md
index eff253f7ad..a4f293d60d 100644
--- a/packages/types/CHANGELOG.md
+++ b/packages/types/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## v0.2.4 - _TBD, 2018_
 
     * Add `data` to `TxData` (#413)
+    * Add `number` as an option to `ContractEventArg` (#413)
 
 ## v0.2.1 - _February 9, 2018_
 
diff --git a/packages/types/src/index.ts b/packages/types/src/index.ts
index 484faa93db..6242d42687 100644
--- a/packages/types/src/index.ts
+++ b/packages/types/src/index.ts
@@ -39,7 +39,7 @@ export enum AbiType {
     Fallback = 'fallback',
 }
 
-export type ContractEventArg = string | BigNumber;
+export type ContractEventArg = string | BigNumber | number;
 
 export interface DecodedLogArgs {
     [argName: string]: ContractEventArg;