diff --git a/tests/test_kernel.py b/tests/test_kernel.py
index 8efc3dcc..2b379eb8 100644
--- a/tests/test_kernel.py
+++ b/tests/test_kernel.py
@@ -106,7 +106,9 @@ def child_target():
 
     def parent_target():
         sleep({interval})
-        Thread(target=child_target).start()
+        thread = Thread(target=child_target)
+        thread.start()
+        thread.join()
 
     Thread(target=parent_target).start()
     """