diff --git a/pybamm/models/submodels/transport_efficiency/bruggeman.py b/pybamm/models/submodels/transport_efficiency/bruggeman.py
index 8ae4d90f22..0a5505b631 100644
--- a/pybamm/models/submodels/transport_efficiency/bruggeman.py
+++ b/pybamm/models/submodels/transport_efficiency/bruggeman.py
@@ -46,5 +46,3 @@ def get_coupled_variables(self, variables):
         variables.update(self._get_standard_transport_efficiency_variables(tor_dict))
 
         return variables
-
-
diff --git a/pybamm/models/submodels/transport_efficiency/heterogeneous_catalyst.py b/pybamm/models/submodels/transport_efficiency/heterogeneous_catalyst.py
index 5b65b14946..4a19ed3d2a 100644
--- a/pybamm/models/submodels/transport_efficiency/heterogeneous_catalyst.py
+++ b/pybamm/models/submodels/transport_efficiency/heterogeneous_catalyst.py
@@ -43,4 +43,4 @@ def get_coupled_variables(self, variables):
                 tor_dict[domain] = tor_k
         variables.update(self._get_standard_transport_efficiency_variables(tor_dict))
 
-        return variables
\ No newline at end of file
+        return variables