diff --git a/festim/exports/txt_export.py b/festim/exports/txt_export.py
index 9e29644c5..9afcc54c9 100644
--- a/festim/exports/txt_export.py
+++ b/festim/exports/txt_export.py
@@ -33,6 +33,7 @@ def __init__(self, field, label, folder, times=None) -> None:
     @property
     def filename(self):
         return f"{self.folder}/{self.label}.txt"
+
     def is_it_time_to_export(self, current_time):
         if self.times is None:
             return True
diff --git a/test/system/test_misc.py b/test/system/test_misc.py
index a7c4214c4..a7a89c249 100644
--- a/test/system/test_misc.py
+++ b/test/system/test_misc.py
@@ -169,9 +169,7 @@ def test_txt_export_all_times(tmp_path):
     my_model.initialise()
     my_model.run()
 
-    assert os.path.exists(
-        "{}/{}.txt".format(my_export.folder, my_export.label)
-    )
+    assert os.path.exists("{}/{}.txt".format(my_export.folder, my_export.label))
 
     data = np.genfromtxt(
         "{}/{}.txt".format(my_export.folder, my_export.label),