diff --git a/ndcube/mixins/plotting.py b/ndcube/mixins/plotting.py
index ee72f9fe1..2470eed1f 100644
--- a/ndcube/mixins/plotting.py
+++ b/ndcube/mixins/plotting.py
@@ -150,7 +150,7 @@ def _plot_3D_cube(self, plot_axis_indices=None, axes_units=None,
         if plot_axis_indices is None:
             plot_axis_indices = [-1, -2]
         if axes_units is None:
-           axes_units = [None, None]
+            axes_units = [None, None]
         i = ImageAnimatorWCS(self.data, wcs=self.wcs, image_axes=plot_axis_indices,
                              unit_x_axis=axes_units[0], unit_y_axis=axes_units[1],
                              axis_ranges=axes_coordinates, **kwargs)
diff --git a/ndcube/tests/test_plotting.py b/ndcube/tests/test_plotting.py
index bdee098eb..1d44888d4 100644
--- a/ndcube/tests/test_plotting.py
+++ b/ndcube/tests/test_plotting.py
@@ -87,7 +87,7 @@ def test_cube_plot_1D(test_input, test_kwargs, expected_values):
     output_ylim = output.axes.get_ylim()
     assert output_ylim[0] <= expected_ylim[0]
     assert output_ylim[1] >= expected_ylim[1]
-    
+
 
 @pytest.mark.parametrize("test_input, test_kwargs, expected_values", [
     (cube[0], {},