diff --git a/masci_tools/tools/greensfunction.py b/masci_tools/tools/greensfunction.py
index d4c5113ac..0588352e4 100644
--- a/masci_tools/tools/greensfunction.py
+++ b/masci_tools/tools/greensfunction.py
@@ -678,7 +678,7 @@ def average_spindiagonal(self) -> None:
                 self._data[name] = data
 
         for name in self._data.keys():
-            for m in range(2*self.lmax+1):
+            for m in range(2 * self.lmax + 1):
                 self._data[name][:, m, m, 0] = (self._data[name][:, m, m, 0] +
                                                 self._data[name][:, m, m, min(1, self.nspins - 1)]) / 2
                 if self.nspins > 1:
@@ -692,7 +692,6 @@ def average_spindiagonal(self) -> None:
                 data = np.einsum('ij,xjk...,km->xim...', rot_real_space.T.conj(), data, rotp_real_space)
                 self._data[name] = data
 
-
     def to_global_frame(self) -> None:
         """
         Rotate the Green's function into the global real space and spin space frame