diff --git a/python/tests/helpers.py b/python/tests/helpers.py
index 387da9ba49..48dd4bffc9 100644
--- a/python/tests/helpers.py
+++ b/python/tests/helpers.py
@@ -93,5 +93,6 @@ def _get_return_code(self):
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         if self.p:
+            group_id = os.getpgid(self.p.pid)
             # Kill the entire process groups (including subprocesses of self.p)
-            os.killpg(os.getpgid(self.p.pid), signal.SIGTERM)
+            os.killpg(group_id, signal.SIGKILL)