diff --git a/tests/python/doc_snippets/coulombslaw_force.py b/tests/python/doc_snippets/coulombslaw_force.py
index bc19cf8bb..9b566430e 100644
--- a/tests/python/doc_snippets/coulombslaw_force.py
+++ b/tests/python/doc_snippets/coulombslaw_force.py
@@ -42,6 +42,7 @@ def run_(self, inputs, submods):
         rv = self.results()
         return pt.wrap_results(rv, E)
 
+
 class ScreenedCoulombsLaw(pp.ModuleBase):
 
     def __init__(self):