diff --git a/cara/tests/models/test_concentration_model.py b/cara/tests/models/test_concentration_model.py
index d7022646..90bc86e4 100644
--- a/cara/tests/models/test_concentration_model.py
+++ b/cara/tests/models/test_concentration_model.py
@@ -129,6 +129,9 @@ def test_concentration_model_constant_parameters():
         )
     )
     times = [0.1, 10, 20, 24]
+    concentration_limits = np.array([c_model.concentration_limit(t)
+                                     for t in times])
     IVRRs = np.array([c_model.infectious_virus_removal_rate(t)
                       for t in times])
+    assert np.all(concentration_limits==concentration_limits[-1])
     assert np.all(IVRRs==IVRRs[-1])