diff --git a/pybamm/experiments/experiment.py b/pybamm/experiments/experiment.py
index 53069115c8..f0fcbb60d3 100644
--- a/pybamm/experiments/experiment.py
+++ b/pybamm/experiments/experiment.py
@@ -162,7 +162,7 @@ def read_operating_conditions(self, operating_conditions, drive_cycles):
         """
         converted_operating_conditions = []
         events = []
-        for idx, cond in enumerate(operating_conditions):
+        for cond in operating_conditions:
             next_op, next_event = self.read_string(cond, drive_cycles)
             converted_operating_conditions.append(next_op)
             events.append(next_event)
diff --git a/tests/unit/test_models/test_full_battery_models/test_lithium_ion/test_spm.py b/tests/unit/test_models/test_full_battery_models/test_lithium_ion/test_spm.py
index f2dd194eb8..0e5960f8a1 100644
--- a/tests/unit/test_models/test_full_battery_models/test_lithium_ion/test_spm.py
+++ b/tests/unit/test_models/test_full_battery_models/test_lithium_ion/test_spm.py
@@ -191,6 +191,11 @@ def test_well_posed_power(self):
         model = pybamm.lithium_ion.SPM(options)
         model.check_well_posedness()
 
+    def test_well_posed_cccv(self):
+        options = {"operating mode": "CCCV"}
+        model = pybamm.lithium_ion.SPM(options)
+        model.check_well_posedness()
+
     def test_well_posed_function(self):
         def external_circuit_function(variables):
             I = variables["Current [A]"]