Harry Styles corrects fan's grammar in concert

Is Harry Styles a stickler for good grammar? Sounds like it!

While performing on Sept. 1 at Philadelphia's Lincoln Financial Field, Styles, 21, motioned to bring a fan's sign to the stage. It read, "Hi Harry, Your so nice." Whoops! It had the wrong "your."

Once he got his hands on the banner, Styles took a marker and corrected it, by adding the missing apostrophe and the "e," so it read "you're."

Another fan captured the moment in a Vine video.

After making the correction, Styles then held up the sign before handing the banner back to fan Taelor Ford. While he was at it, Styles also autographed it for her.

The members of One Direction recently confirmed that they are taking a break as a band.