diff --git a/test/built-ins/TypedArray/prototype/sort/BigInt/sortcompare-with-no-tostring.js b/test/built-ins/TypedArray/prototype/sort/BigInt/sortcompare-with-no-tostring.js
index 3f6402c667..f588b36bcc 100644
--- a/test/built-ins/TypedArray/prototype/sort/BigInt/sortcompare-with-no-tostring.js
+++ b/test/built-ins/TypedArray/prototype/sort/BigInt/sortcompare-with-no-tostring.js
@@ -18,10 +18,14 @@ includes: [testBigIntTypedArray.js, compareArray.js]
 features: [BigInt, TypedArray]
 ---*/
 
-var origToString = Number.prototype.toString;
+var toStringCalled = false;
+BigInt.prototype.toString = function() {
+  toStringCalled = true;
+}
 
 testWithBigIntTypedArrayConstructors(function(TA) {
   var sample = new TA([20n, 100n, 3n]);
   var result = sample.sort();
+  assert.sameValue(toStringCalled, false, "BigInt.prototype.toString will not be called");
   assert(compareArray(result, [3n, 20n, 100n]));
 });
diff --git a/test/built-ins/TypedArray/prototype/sort/sortcompare-with-no-tostring.js b/test/built-ins/TypedArray/prototype/sort/sortcompare-with-no-tostring.js
index f3bb0cac03..591c9087b0 100644
--- a/test/built-ins/TypedArray/prototype/sort/sortcompare-with-no-tostring.js
+++ b/test/built-ins/TypedArray/prototype/sort/sortcompare-with-no-tostring.js
@@ -18,10 +18,14 @@ includes: [testTypedArray.js, compareArray.js]
 features: [TypedArray]
 ---*/
 
-var origToString = Number.prototype.toString;
+var toStringCalled = false;
+Number.prototype.toString = function() {
+  toStringCalled = true;
+}
 
 testWithTypedArrayConstructors(function(TA) {
   var sample = new TA([20, 100, 3]);
   var result = sample.sort();
-  assert(compareArray(result, [3, 20, 100]));
+  assert.sameValue(toStringCalled, false, "Number.prototype.toString will not be called");
+  assert(compareArray(result, [3, 20, 100]), "Default sorting by value");
 });