diff --git a/zfs-backup.py b/zfs-backup.py
index 4821bc2..64ab537 100755
--- a/zfs-backup.py
+++ b/zfs-backup.py
@@ -614,6 +614,7 @@ class Cryptsetup(CommandInterface):
 
 class Pool:
     """Represents an internal pool."""
+
     def __init__(self, name: str):
         self._name = name
         self._path: ZFSPath = ZFSPath.from_string(name)
@@ -629,6 +630,7 @@ class Pool:
 
 class ExternalPool(Pool):
     """Represents an external pool."""
+
     def __init__(self, name: str, disk: Disk):
         super().__init__(name)
         self._imported: bool = False