LAS CRUCES, N.M. (AP) — Oklahoma State University is suing New Mexico State University over the use of a pistol-packing mascot that it says is “confusingly similar” to the Cowboys’ own Pistol Pete.

Oklahoma State, which filed suit Monday in U.S. District Court in Oklahoma, wants NMSU to stop using the mascot, sometimes referred to in Las Cruces as “Classic Aggie.”

OSU said it trademarked the mascot first and has used the image since 1930.

“The university is strongly opposed to any effort to infringe upon its trademarks and will take the necessary steps to protect its rights to the Pistol Pete marks,” OSU officials said in a statement.