1 files changed, 1 insertions, 0 deletions
diff --git a/src/types.ts b/src/types.ts
index 2af778677..b7ee9c946 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -237,6 +237,7 @@ export interface LogErrorContractEventArgs {
     orderHash: string;
 }
 export type ContractEventArgs = LogFillContractEventArgs|LogCancelContractEventArgs|LogErrorContractEventArgs;
+export type ContractEventArg = string|BigNumber.BigNumber;
 
 export interface Order {
     maker: string;