The only smudge on an otherwise stellar rookie season came Wednesday for Washington Redskins quarterback Robert Griffin III.

Griffin was fined $10,000 by the NFL for wearing Adidas during the Redskins postgame press conference Sunday.

The league’s official sponsor is apparel giant Nike, which designed this season’s jerseys, but Griffin has a personal deal with Adidas. However, this is nothing new for Griffin, who actually taped over the Nike logo on his jersey in the Redskins season opener.

The NFL has very strict guidelines for its jerseys, from numbers relegated to specific positions to where the league’s logo is placed on helmets.

The Baylor alum did not play in Washington’s 38-21 win over the Cincinnati Bengals due to a sprained knee, but the 8-6 Redskins are now first in the NFC East and poised for a playoff run.

Griffin returned to practice Wednesday, and is expected to start in Week 16 against the Philadelphia Eagles.