diff --git a/spec/asynciterable/catcherror-spec.ts b/spec/asynciterable/catcherror-spec.ts
index 44907dbb..d1d5ab3f 100644
--- a/spec/asynciterable/catcherror-spec.ts
+++ b/spec/asynciterable/catcherror-spec.ts
@@ -1,3 +1,4 @@
+import { jest } from '@jest/globals';
 import { skip } from 'ix/asynciterable/operators.js';
 import { hasNext } from '../asynciterablehelpers.js';
 import {
@@ -42,11 +43,13 @@ test('AsyncIterable#catchError still throws', async () => {
 });
 
 test('AsyncIterable#catchError calls return() on source iterator when stopped early', async () => {
-  const xs1 = range(0, 2);
+  const e1 = new Error();
+  const er1 = throwError(e1);
+
   const xs2 = range(2, 2)[Symbol.asyncIterator]();
   const returnSpy = jest.spyOn(xs2, 'return');
 
-  const res = catchError(xs1, from(xs2)).pipe(skip(2));
+  const res = catchError(concat(range(0, 2), er1), from(xs2)).pipe(skip(2));
 
   await first(res);
 
diff --git a/spec/iterable/catcherror-spec.ts b/spec/iterable/catcherror-spec.ts
index 245c8efb..658716fb 100644
--- a/spec/iterable/catcherror-spec.ts
+++ b/spec/iterable/catcherror-spec.ts
@@ -43,11 +43,13 @@ test('Iterable.catchError still throws', () => {
 });
 
 test('Iterable.catchError calls return() on source iterator when stopped early', () => {
-  const xs1 = range(0, 2);
+  const e1 = new Error();
+  const er1 = throwError(e1);
+
   const xs2 = range(2, 2)[Symbol.iterator]();
   const returnSpy = jest.spyOn(xs2, 'return');
 
-  const res = catchError(xs1, from(xs2)).pipe(skip(2));
+  const res = catchError(concat(range(0, 2), er1), from(xs2)).pipe(skip(2));
 
   first(res);