diff --git a/tests/SimpleActorTest.cpp b/tests/SimpleActorTest.cpp
index 5215fc63bde83460130bbee7805b038d4bb54dc5..c6b8b60d5025340ff94d00d234a6a51065a12051 100644
--- a/tests/SimpleActorTest.cpp
+++ b/tests/SimpleActorTest.cpp
@@ -37,7 +37,7 @@ static void mainFiber(void* runtime_ptr) {
 	SumActor sumActor(runtime);
 	sumActor.start();
 
-	CPS cps;
+	CPS cps(FIBER_COUNT);
 	for (unsigned int i = 0; i < FIBER_COUNT; ++i) {
 		spawn([&sumActor, i] {
 				WDBG(Dispatcher::getCurrentFiber() << " starts to count to " << FIBERS_COUNT_TO);