diff --git a/kernel/trunk/runtests.py b/kernel/trunk/runtests.py
index 89657cf2b1..6233beae9a 100755
--- a/kernel/trunk/runtests.py
+++ b/kernel/trunk/runtests.py
@@ -246,8 +246,8 @@ if __name__ == "__main__":
     tests = collect_tests()
     umka_tests = collect_umka_tests()
     serial_executor_thread = run_tests_serially(tests, root_dir)
-    serial_executor_thread.join()
     if enable_umka:
         for umka_test in umka_tests:
             run_umka_test(root_dir, umka_test)
+    serial_executor_thread.join()