diff --git a/src/middlewared/middlewared/alert/base.py b/src/middlewared/middlewared/alert/base.py
index 78189deff399..7da41ce42b4a 100644
--- a/src/middlewared/middlewared/alert/base.py
+++ b/src/middlewared/middlewared/alert/base.py
@@ -61,7 +61,7 @@ def format(cls, args):
         if args is None:
             return cls.text
 
-        return cls.text % args
+        return cls.text % (tuple(args) if isinstance(args, list) else args)
 
 
 class OneShotAlertClass: