diff --git a/conftest.py b/conftest.py
--- a/conftest.py
+++ b/conftest.py
@@ -5,6 +5,24 @@
 
 import os
 
+import pytest
+
 pytest_plugins = ["swh.scheduler.pytest_plugin"]
 
 os.environ["LC_ALL"] = "C.UTF-8"
+
+
+@pytest.fixture
+def mock_get_scheduler(monkeypatch, swh_scheduler):
+    """Override the get_scheduler function in swh.lister.core.lister_base, to
+    return the swh_scheduler fixture.
+    """
+    from swh.lister.core import lister_base
+
+    # Match the signature from swh.scheduler.get_scheduler
+    def get_scheduler(cls, args={}):
+        return swh_scheduler
+
+    monkeypatch.setattr(lister_base, "get_scheduler", get_scheduler)
+
+    yield monkeypatch
diff --git a/swh/lister/core/tests/conftest.py b/swh/lister/core/tests/conftest.py
--- a/swh/lister/core/tests/conftest.py
+++ b/swh/lister/core/tests/conftest.py
@@ -27,14 +27,12 @@
 
 
 @pytest.fixture
-def swh_listers(request, lister_db_url, swh_scheduler):
-
+def swh_listers(mock_get_scheduler, lister_db_url, swh_scheduler):
     listers = {}
 
     # Prepare schema for all listers
     for lister_name in SUPPORTED_LISTERS:
         lister = get_lister(lister_name, db_url=lister_db_url)
-        lister.scheduler = swh_scheduler  # inject scheduler fixture
         listers[lister_name] = lister
     initialize(create_engine(lister_db_url), drop_tables=True)
 
diff --git a/swh/lister/tests/test_cli.py b/swh/lister/tests/test_cli.py
--- a/swh/lister/tests/test_cli.py
+++ b/swh/lister/tests/test_cli.py
@@ -20,7 +20,7 @@
     assert "Invalid lister" in str(e.value)
 
 
-def test_get_lister():
+def test_get_lister(mock_get_scheduler):
     """Instantiating a supported lister should be ok
 
     """