diff --git a/openwrt_backup/utils.py b/openwrt_backup/utils.py
index 5a227e8..0b6426b 100755
--- a/openwrt_backup/utils.py
+++ b/openwrt_backup/utils.py
@@ -1,6 +1,8 @@
-import paramiko
 from pathlib import Path
 from subprocess import list2cmdline
+from typing import Union
+
+import paramiko
 
 
 def connection_from_config(name: str, ssh_config_root: Path):
@@ -44,7 +46,7 @@ def connection_from_config(name: str, ssh_config_root: Path):
     return client
 
 
-def exec_remote(connection: paramiko.SSHClient, command):
+def exec_remote(connection: paramiko.SSHClient, command: Union[str, list]):
     """Function to execute specified command on conection"""
     if not isinstance(command, str):
         command = list2cmdline(command)