diff --git a/tests/test_kernels.py b/tests/test_kernels.py
index c8273b9..2e192da 100644
--- a/tests/test_kernels.py
+++ b/tests/test_kernels.py
@@ -223,7 +223,7 @@ def test_mixing():
 
     fieldset = pp.constructors.create_fieldset(settings)
     fieldset.add_constant('max_depth', fieldset.U.depth[-1])
-    
+
     kernels = [parcels.application_kernels.AdvectionRK4_3D, pp.kernels.checkThroughBathymetry,
                pp.kernels.checkErrorThroughSurface, pp.kernels.deleteParticle]