diff --git a/tests/thread_test2.py b/tests/thread_test2.py
index 063015a8..d3420291 100644
--- a/tests/thread_test2.py
+++ b/tests/thread_test2.py
@@ -41,6 +41,9 @@ class ThreadTest(object):
             executor_internal = ThreadPoolExecutor(max_workers=5)
             f1 = executor_internal.submit(self.major_func, i=1)
             f2 = executor_internal.submit(self.major_func, i=2)
+            f2 = executor_internal.submit(self.major_func, i=3)
+            f2 = executor_internal.submit(self.major_func, i=4)
+            f2 = executor_internal.submit(self.major_func, i=5)
             executor_internal.shutdown()
             f1.result()
             f2.result()