Error running generated script from Object Explorer | Tables | Script tab: "Incorrect syntax near (62740)

User right-clicks on a table name in Object Explorer and selects View Table.  Under Script tab, he enables â€Permissionss†checkbox and Toad generates the following command:

GRANT DELETE ON [db].[table] TO domain\username;
GO

Where domain is the domain name of MS Active Directory network logon.  Running the above command will result in the following error:

"Error:4/19/2010 4:30:16 PM 0:00:00.000: SQL Server Database Error: Incorrect syntax near..."

Missing brackets around "domain/username".

WORKAROUND:
Enclose domain/username with brackets as such before running command:

GRANT DELETE ON [db].[table] TO [domain\username];