diff --git a/zfs-backup.py b/zfs-backup.py
index eb70e1d..a0365d7 100755
--- a/zfs-backup.py
+++ b/zfs-backup.py
@@ -274,10 +274,9 @@ class ZFS:
         # -u  File system that is associated with the received stream is not mounted.
         if not isinstance(pool, Pool):
             raise TypeError("Can only receive into pools.")
-        # TODO use internal functions
-        check_output(
+        Command.receive_from_stream(
             [config.ZFS, "receive", "-d", "-F", "-u", pool.name],
-            stdin=stream.stdout,
+            stream,
         )
 
     @classmethod
@@ -489,7 +488,7 @@ class Snapshot:
 
 class Command:
     @staticmethod
-    def run(cmdline: list[str]):
+    def run(cmdline: list[str]) -> None:
         call(cmdline)
 
     @staticmethod
@@ -498,6 +497,10 @@ class Command:
             cmdline = [cmdline]
         return check_output(cmdline).strip().decode()
 
+    @staticmethod
+    def receive_from_stream(cmdline: str | list[str], stream: Popen) -> None:
+        check_output(cmdline, stdin=stream.stdout)
+
 
 def verify_running_as_root():
     if getuid() > 0: