diff --git a/tests/conftest.py b/tests/conftest.py
index d5cb609c..c7f5f483 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -49,7 +49,7 @@ def prev_test_failed():
 
 
 def pytest_addoption(parser):
-    parser.addoption("--traffic", action="store_false", help="run tests with traffic")
+    parser.addoption("--traffic", action="store_true", help="run tests with traffic")
     parser.addoption("--testbed", action="store", help="Testbed name", required=True)