diff --git a/Python/pywarpx/picmi.py b/Python/pywarpx/picmi.py
index 1b3a8bacad2..c7a27f62df0 100644
--- a/Python/pywarpx/picmi.py
+++ b/Python/pywarpx/picmi.py
@@ -3270,6 +3270,7 @@ def diagnostic_initialize_inputs(self):
 
 ElectrostaticFieldDiagnostic = FieldDiagnostic
 
+
 class TimeAveragedFieldDiagnostic(FieldDiagnostic):
     """
     See `Input Parameters <https://warpx.readthedocs.io/en/latest/usage/parameters.html>`__ for more information.
@@ -3321,7 +3322,6 @@ def diagnostic_initialize_inputs(self):
         self.diagnostic.average_start_step = self.average_start_step
 
 
-
 class Checkpoint(picmistandard.base._ClassWithInit, WarpXDiagnosticBase):
     """
     Sets up checkpointing of the simulation, allowing for later restarts