diff --git a/troveclient/v1/shell.py b/troveclient/v1/shell.py
index b8ce02de..bb0d4b60 100644
--- a/troveclient/v1/shell.py
+++ b/troveclient/v1/shell.py
@@ -208,7 +208,7 @@ def restart(cs, args):
 @utils.service_type('database')
 def do_show_backup(cs, args):
     """Show details of a backup."""
-    backups = _find_backup(args.backup)
+    backup = _find_backup(cs, args.backup)
     _print_instance(backup)