diff --git a/nifty4/minimization/energy_sum.py b/nifty4/minimization/energy_sum.py
index 0299e02a19c416e22833fd46ad07e53bc48067fa..5a4453109787e8add6b9c34785e91284ca2f1d36 100644
--- a/nifty4/minimization/energy_sum.py
+++ b/nifty4/minimization/energy_sum.py
@@ -64,4 +64,3 @@ class EnergySum(Energy):
         from .conjugate_gradient import ConjugateGradient
         return InversionEnabler(
             res, ConjugateGradient(self._min_controller), precon)
-