diff --git a/km3buu/output.py b/km3buu/output.py
index 09360b645ac58bf3cdf6fdfbbd5204dce288b87a..00656358b6870f504a45de897fb9fa4572a69d3a 100644
--- a/km3buu/output.py
+++ b/km3buu/output.py
@@ -303,8 +303,10 @@ class GiBUUOutput:
         self.flux_interpolation = UnivariateSpline(self.flux_data["energy"],
                                                    self.flux_data["events"],
                                                    s=0)
-        self._energy_min = np.min(self.flux_data["energy"][self.flux_data["events"] > 0])
-        self._energy_max = np.max(self.flux_data["energy"][self.flux_data["events"] > 0])
+        self._energy_min = np.min(
+            self.flux_data["energy"][self.flux_data["events"] > 0])
+        self._energy_max = np.max(
+            self.flux_data["energy"][self.flux_data["events"] > 0])
         self._generated_events = int(np.sum(self.flux_data["events"]))
         return True