diff --git a/tests/test_linear_incident_uptake_model.py b/tests/test_linear_incident_uptake_model.py
index a9613f2..53aaaa7 100644
--- a/tests/test_linear_incident_uptake_model.py
+++ b/tests/test_linear_incident_uptake_model.py
@@ -65,7 +65,7 @@ def params():
 
 
 @pytest.fixture
-def mcmc():
+def mcmc_params():
     """
     Mock set of mcmc control parameters.
     """
@@ -115,14 +115,14 @@ def test_extract_standards(frame):
     assert output == correct
 
 
-def test_fit(frame, params, mcmc):
+def test_fit(frame, params, mcmc_params):
     """
     Model should produce posterior samples for each parameter.
     """
 
     data = iup.IncidentUptakeData(frame)
     model = iup.models.LinearIncidentUptakeModel(0).fit(
-        data, ["geography"], params, mcmc
+        data, ["geography"], params, mcmc_params
     )
 
     dimensions = [value.shape[0] for key, value in model.mcmc.get_samples().items()]