diff --git a/gusto/configuration.py b/gusto/configuration.py
index 901b6d6d3..3694ae9ea 100644
--- a/gusto/configuration.py
+++ b/gusto/configuration.py
@@ -199,4 +199,4 @@ class BoundaryLayerParameters(Configuration):
     coeff_heat = 1.1e-3         # Dimensionless surface sensible heat coefficient
     coeff_evap = 1.1e-3         # Dimensionless surface evaporation coefficient
     height_surface_layer = 75.  # Height (m) of surface level (usually lowest level)
-    mu = 100.                   # Interior penalty coefficient for vertical diffusion
\ No newline at end of file
+    mu = 100.                   # Interior penalty coefficient for vertical diffusion
diff --git a/integration-tests/physics/test_boundary_layer_mixing.py b/integration-tests/physics/test_boundary_layer_mixing.py
index a9446f150..1b0499e70 100644
--- a/integration-tests/physics/test_boundary_layer_mixing.py
+++ b/integration-tests/physics/test_boundary_layer_mixing.py
@@ -140,4 +140,4 @@ def test_boundary_layer_mixing(tmpdir, field_name, recovered, semi_implicit):
     initial_data, _ = domain.coords.get_column_data(initial_field, domain)
 
     # Check first column
-    assert field_data[0,0] < 0.999*initial_data[0,0]
+    assert field_data[0, 0] < 0.999*initial_data[0, 0]
diff --git a/integration-tests/physics/test_suppress_vertical_wind.py b/integration-tests/physics/test_suppress_vertical_wind.py
index 684aa2e51..250916227 100644
--- a/integration-tests/physics/test_suppress_vertical_wind.py
+++ b/integration-tests/physics/test_suppress_vertical_wind.py
@@ -92,4 +92,4 @@ def test_suppress_vertical_wind(tmpdir):
     vertical_wind.interpolate(dot(u, domain.k))
 
     tol = 1e-12
-    assert norm(vertical_wind) < tol
\ No newline at end of file
+    assert norm(vertical_wind) < tol