diff --git a/test/built-ins/TypedArrayConstructors/ctors-bigint/buffer-arg/invoked-with-undefined-newtarget-sab.js b/test/built-ins/TypedArrayConstructors/ctors-bigint/buffer-arg/invoked-with-undefined-newtarget-sab.js
index 10f1c12faf..4b242832d9 100644
--- a/test/built-ins/TypedArrayConstructors/ctors-bigint/buffer-arg/invoked-with-undefined-newtarget-sab.js
+++ b/test/built-ins/TypedArrayConstructors/ctors-bigint/buffer-arg/invoked-with-undefined-newtarget-sab.js
@@ -20,7 +20,7 @@ features: [BigInt, SharedArrayBuffer, TypedArray]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {
-  var buffer = new SharedArrayBuffer(4);
+  var buffer = new SharedArrayBuffer(TA.BYTES_PER_ELEMENT);
   assert.throws(TypeError, function() {
     TA(buffer);
   });
diff --git a/test/built-ins/TypedArrayConstructors/ctors-bigint/buffer-arg/invoked-with-undefined-newtarget.js b/test/built-ins/TypedArrayConstructors/ctors-bigint/buffer-arg/invoked-with-undefined-newtarget.js
index c746dc1889..623c193af7 100644
--- a/test/built-ins/TypedArrayConstructors/ctors-bigint/buffer-arg/invoked-with-undefined-newtarget.js
+++ b/test/built-ins/TypedArrayConstructors/ctors-bigint/buffer-arg/invoked-with-undefined-newtarget.js
@@ -19,7 +19,7 @@ features: [BigInt, TypedArray]
 ---*/
 
 testWithBigIntTypedArrayConstructors(function(TA) {
-  var buffer = new ArrayBuffer(4);
+  var buffer = new ArrayBuffer(TA.BYTES_PER_ELEMENT);
   assert.throws(TypeError, function() {
     TA(buffer);
   });