diff --git a/test/test_process_pool_spawn.py b/test/test_process_pool_spawn.py
index f839b0a..d734bdf 100644
--- a/test/test_process_pool_spawn.py
+++ b/test/test_process_pool_spawn.py
@@ -315,7 +315,7 @@ def stop_pool_callback(_):
             future = pool.schedule(function, args=[1])
             future.add_done_callback(stop_pool_callback)
             with self.assertRaises(RuntimeError):
-                for index in range(10):
+                for index in range(30):
                     time.sleep(0.1)
                     pool.schedule(long_function, args=[index])