diff --git a/tests/runtime/common/gc/startGc.js b/tests/runtime/common/gc/startGc.js
index 22efb0eb7cc34f4d8fd74cdbe499ac9eb5107cbd..e36fa616fda5a0f7b4c905cce5a5cbe4dd2cd254 100644
--- a/tests/runtime/common/gc/startGc.js
+++ b/tests/runtime/common/gc/startGc.js
@@ -20,10 +20,10 @@ import { assert, newWeakRefInYoung } from 'common.abc';
 
 // allocate an object of size in bytes at least 'sizeInBytes'
 function allocLargeObject() {
-    // Ctor Array(length) doesn't allocates the internal JSTaggedValue array.
+    // Ctor Array(length) doesn't allocate the internal JSTaggedValue array.
     // Only length setter does this.
     let big = new Array();
-    for (let i = 0; i < 60; ++i) {
+    for (let i = 0; i < 120; ++i) {
         let a = allocateArrayObject(1024 * 8);
         if (i % 2 == 0) {
             big[i] = a;