diff --git a/festim/boundary_conditions/fluxes/surface_kinetics.py b/festim/boundary_conditions/fluxes/surface_kinetics.py
index 77df91caa..53bf3f54f 100644
--- a/festim/boundary_conditions/fluxes/surface_kinetics.py
+++ b/festim/boundary_conditions/fluxes/surface_kinetics.py
@@ -96,7 +96,7 @@ def __init__(
         J_vs,
         surfaces,
         initial_condition,
-        **prms
+        **prms,
     ) -> None:
         super().__init__(surfaces=surfaces, field=0)
         self.k_sb = k_sb