diff --git a/mdsuite/calculators/coordination_number_calculation.py b/mdsuite/calculators/coordination_number_calculation.py
index cce27286..bd1ca787 100644
--- a/mdsuite/calculators/coordination_number_calculation.py
+++ b/mdsuite/calculators/coordination_number_calculation.py
@@ -74,7 +74,9 @@ def _integrate_rdf(radii_data: np.array, rdf_data: np.array, density: float) ->
     integral_data : np.array
             Cumulative integral of the RDF scaled by the radius and denisty.
     """
-    integral_data = cumulative_trapezoid(y=radii_data[1:] ** 2 * rdf_data[1:], x=radii_data[1:])
+    integral_data = cumulative_trapezoid(
+        y=radii_data[1:] ** 2 * rdf_data[1:], x=radii_data[1:]
+    )
 
     return 4 * np.pi * density * integral_data