diff --git a/borgmatic/config/environment.py b/borgmatic/config/environment.py
index 396578b..49d673b 100644
--- a/borgmatic/config/environment.py
+++ b/borgmatic/config/environment.py
@@ -1,7 +1,6 @@
 import os
 import re
 
-
 _VARIABLE_PATTERN = re.compile(r'(?<!\\)\$\{(?P<name>[A-Za-z0-9_]+)((:?-)(?P<default>[^}]+))?\}')