diff --git a/tests/runtime/common/gc/CMakeLists.txt b/tests/runtime/common/gc/CMakeLists.txt
index 3ae0b8790e53ca1d4aa67888f44c1001c2e9c969..88e696d3df952381917b814080c4bd6142627b8a 100644
--- a/tests/runtime/common/gc/CMakeLists.txt
+++ b/tests/runtime/common/gc/CMakeLists.txt
@@ -133,7 +133,7 @@ add_dependencies(mm_tests
 
 # Use --gc-trigger-type=debug-never to control GC in the test.
 # In the test we don't need the runtime triggers GC during allocation.
-panda_add_ecma_gc_test(FILE startGc.js OPTIONS "--gc-trigger-type=debug-never")
+panda_add_ecma_gc_test(FILE startGc.js OPTIONS "--gc-trigger-type=debug-never" "--g1-region-garbage-rate-threshold=0")
 panda_add_ecma_gc_test(FILE scheduleGc.js OPTIONS "--gc-trigger-type=debug-never" "--gc-use-nth-alloc-trigger=true")
 panda_add_ecma_gc_test(FILE spaceTypeTest.js OPTIONS "--gc-type=g1-gc" "--run-gc-in-place=true")
 panda_add_ecma_gc_test(FILE concurrent.js OPTIONS "--gc-type=g1-gc" "--gc-trigger-type=debug-never")
diff --git a/tests/runtime/common/gc/startGc.js b/tests/runtime/common/gc/startGc.js
index 22efb0eb7cc34f4d8fd74cdbe499ac9eb5107cbd..b2c8d83cf2ccd4da78105e6c71a18ebc1c8b4b09 100644
--- a/tests/runtime/common/gc/startGc.js
+++ b/tests/runtime/common/gc/startGc.js
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022 Huawei Device Co., Ltd.
+ * Copyright (c) 2022-2024 Huawei Device Co., Ltd.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
@@ -65,6 +65,10 @@ waitForFinishGC(task_discarded_id);
 
 // test mixed GC
 ref = newWeakRefInCollectibleTenured();
+// Add more garbage objects and trigger concurrent marking
+// to add garbage regions into collection set
+makeTenuredCollectible();
+waitForFinishGC(startGC("threshold"));
 gc = startGC("mixed");
 waitForFinishGC(gc);
 assert(ref.deref() === undefined, "Mixed GC didn't collect weak ref");