diff --git a/captain/tests/test_reactive.py b/captain/tests/test_reactive.py
index eb9a7bd..52c3104 100644
--- a/captain/tests/test_reactive.py
+++ b/captain/tests/test_reactive.py
@@ -33,7 +33,7 @@ def pub(x, id):
 
     # TODO: Maybe we should do something like flow.wire() to trigger the
     # wire process instead of doing it upon construction?
-    flow = Flow(fc, pub, start_obs)
+    _ = Flow(fc, pub, start_obs)
     start_obs.on_next({})
 
     assert outputs["constant1"] == 2