1 files changed, 1 insertions, 0 deletions
diff --git a/src/types.ts b/src/types.ts
index 200e65d56..708695890 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -229,6 +229,7 @@ export interface LogErrorContractEventArgs {
     orderHash: string;
 }
 export type ContractEventArgs = LogFillContractEventArgs|LogCancelContractEventArgs|LogErrorContractEventArgs;
+export type ContractEventArg = string|BigNumber.BigNumber;
 
 export interface Order {
     maker: string;