1 files changed, 2 insertions, 2 deletions
diff --git a/packages/order-utils/test/utils/simple_erc20_balance_and_proxy_allowance_fetcher.ts b/packages/order-utils/test/utils/simple_erc20_balance_and_proxy_allowance_fetcher.ts
index 68f6a164c..279a5c0db 100644
--- a/packages/order-utils/test/utils/simple_erc20_balance_and_proxy_allowance_fetcher.ts
+++ b/packages/order-utils/test/utils/simple_erc20_balance_and_proxy_allowance_fetcher.ts
@@ -5,8 +5,8 @@ import { AbstractBalanceAndProxyAllowanceFetcher } from '../../src/abstract/abst
 import { ERC20TokenContract } from '../../src/generated_contract_wrappers/erc20_token';
 
 export class SimpleERC20BalanceAndProxyAllowanceFetcher implements AbstractBalanceAndProxyAllowanceFetcher {
-    private _erc20TokenContract: ERC20TokenContract;
-    private _erc20ProxyAddress: string;
+    private readonly _erc20TokenContract: ERC20TokenContract;
+    private readonly _erc20ProxyAddress: string;
     constructor(erc20TokenWrapper: ERC20TokenContract, erc20ProxyAddress: string) {
         this._erc20TokenContract = erc20TokenWrapper;
         this._erc20ProxyAddress = erc20ProxyAddress;