diff --git a/beat/core/test/test_docker_environments.py b/beat/core/test/test_docker_environments.py
index 6f994d9c06b99abe4d74fbb0bd38a2fe7e997758..5ad8431296db898bdfbee90c988212c1046df6dd 100644
--- a/beat/core/test/test_docker_environments.py
+++ b/beat/core/test/test_docker_environments.py
@@ -52,7 +52,7 @@ class EnvironmentTest(unittest.TestCase):
 
     def tearDown(self):
         self.host.teardown()
-        assert not self.host.containers  # All containers are gone
+        self.assertFalse(self.host.containers)  # All containers are gone
 
     @slow
     def test_package_enumeration(self):