diff --git a/tests/test_backup.py b/tests/test_backup.py
index ca2e47358844291bb1d973479713285717f440a6..8e760b7548dff7c84813dd77fe5666b6be2081cd 100755
--- a/tests/test_backup.py
+++ b/tests/test_backup.py
@@ -88,7 +88,7 @@ def test_last_backup_is_recent(server: str) -> bool:
             "-maxdepth 1",
             "-xtype l",
             "-name latest",
-            "-exec realpath {} +"  # must always be last arg
+            "-exec realpath {} +",  # must always be last arg
         )
         cmd = "ssh -o StrictHostKeyChecking=no {} '{}'".format(server, find)
         status, out = subprocess.getstatusoutput(cmd)
@@ -205,17 +205,17 @@ def main():
     local_backup_folders = conf.get("LOCAL_BACKUP_FOLDERS")
     if backup_server:
         if not test_ssh(backup_server):
-            sys.exit(1)
+            exit(1)
         else:
             if not test_last_backup_is_recent(backup_server):
-                sys.exit(1)
+                exit(1)
             else:
-                sys.exit(0)
+                exit(0)
     elif local_backup_folders:
-        sys.exit(not check_local_backups(local_backup_folders))
+        exit(not check_local_backups(local_backup_folders))
     else:
         print("No backup_server defined in config, untestable")
-        sys.exit(2)
+        exit(2)
 
 
 if __name__ == "__main__":