diff --git a/royalnet/campaigns/tests/test_asynccampaign.py b/royalnet/campaigns/tests/test_asynccampaign.py
index f158ae4d..06be24ee 100644
--- a/royalnet/campaigns/tests/test_asynccampaign.py
+++ b/royalnet/campaigns/tests/test_asynccampaign.py
@@ -37,7 +37,7 @@ async def test_failing_check():
 
     campaign, = await AsyncCampaign.create(start=gen())
     with pytest.raises(ChallengeFailedError):
-        await campaign.next(None)
+        await campaign.next()
 
 
 @pytest.mark.asyncio
diff --git a/royalnet/campaigns/tests/test_campaign.py b/royalnet/campaigns/tests/test_campaign.py
index 4be60973..c86e371d 100644
--- a/royalnet/campaigns/tests/test_campaign.py
+++ b/royalnet/campaigns/tests/test_campaign.py
@@ -34,7 +34,7 @@ def test_failing_check():
 
     campaign, = Campaign.create(start=gen())
     with pytest.raises(ChallengeFailedError):
-        campaign.next(None)
+        campaign.next()
 
 
 def test_switching():