diff --git a/selftests/functional/test_utils.py b/selftests/functional/test_utils.py
index 746fa620cbacade4b2d65e7d017cf46dc81ae217..bc3a1935d75ffacc643b6183ae231ea58ffe69bc 100644
--- a/selftests/functional/test_utils.py
+++ b/selftests/functional/test_utils.py
@@ -142,6 +142,7 @@ class ProcessTest(unittest.TestCase):
         proc = process.SubProcess('%s 1' % self.fake_vmstat)
         proc.start()
         time.sleep(3)
+        proc.terminate()
         proc.wait(timeout=1)
         stdout = proc.get_stdout().decode()
         self.assertIn('memory', stdout, 'result: %s' % stdout)