Not really anything to worry about

Ending a sentence with a preposition (such as with, of, and to [or about]) is permissible in the English language.

Many people believe that the rule originated with the 17th century poet John Dryden, who in 1672 chastised Ben Jonson: "The preposition in the end of the sentence; a common fault with him.” Jonson probably didn’t take much heed of this admonition, seeing as how he was dead, but untold millions of people have suffered in the subsequent years as a result.