diff --git a/packages/node/src/__tests__/test-helpers/test-fetch-client.ts b/packages/node/src/__tests__/test-helpers/test-fetch-client.ts
index 73a93e6ba..966f097f1 100644
--- a/packages/node/src/__tests__/test-helpers/test-fetch-client.ts
+++ b/packages/node/src/__tests__/test-helpers/test-fetch-client.ts
@@ -11,10 +11,10 @@ export type TestFetchClientOptions = {
  * Try not to use this directly -- use createTestAnalytics instead.
  */
 export class TestFetchClient implements CustomHTTPClient {
-  private withError: TestFetchClientOptions['withError']
+  private withError?: TestFetchClientOptions['withError']
   private response?: TestFetchClientOptions['response']
   constructor({ withError, response }: TestFetchClientOptions = {}) {
-    this.withError = withError || false
+    this.withError = withError
     this.response = response
   }
   send(..._args: Parameters<CustomHTTPClient['send']>) {