diff --git a/zfs-backup.py b/zfs-backup.py
index 4e331df..5160279 100755
--- a/zfs-backup.py
+++ b/zfs-backup.py
@@ -82,10 +82,10 @@ class Manager:
                 stream = self._send_absolute(local_dataset)
             ZFS.receive(stream, self._external_pool)
 
-    def _send_incremental(self, local_dataset: Dataset, remote_dataset: Dataset) -> Popen:
-        start_snapshot = self._get_last_common_snapshot(
-            local_dataset, remote_dataset
-        )
+    def _send_incremental(
+        self, local_dataset: Dataset, remote_dataset: Dataset
+    ) -> Popen:
+        start_snapshot = self._get_last_common_snapshot(local_dataset, remote_dataset)
         end_snapshot = self._get_last_snapshot_with_backup_tag(local_dataset)
         stream = ZFS.send_incremental(start_snapshot, end_snapshot)
         return stream
@@ -118,7 +118,9 @@ class Manager:
         ]
 
     @staticmethod
-    def _search_matching_dataset_in_remote_pool(dataset: Dataset, pool: Pool) -> Dataset | None:
+    def _search_matching_dataset_in_remote_pool(
+        dataset: Dataset, pool: Pool
+    ) -> Dataset | None:
         dataset_to_search = dataset.replace_pool(pool.name)
         for dataset in pool.datasets:
             if dataset == dataset_to_search: