diff --git a/packages/types/src/index.ts b/packages/types/src/index.ts
index c038df50c1..3c9b6bbc58 100644
--- a/packages/types/src/index.ts
+++ b/packages/types/src/index.ts
@@ -158,12 +158,12 @@ export enum AssetProxyId {
 }
 
 export interface ERC20AssetData {
-    assetProxyId: AssetProxyId.ERC20;
+    assetProxyId: string;
     tokenAddress: string;
 }
 
 export interface ERC721AssetData {
-    assetProxyId: AssetProxyId.ERC721;
+    assetProxyId: string;
     tokenAddress: string;
     tokenId: BigNumber;
 }