It’s no secret that Bruce Willis is hard to work with.

So when it was announced this week that Harrison Ford will be replacing Willis in “Expendables 3,” the movie’s co-star and first installment director, Sylvester Stallone, was openly overjoyed.

Stallone took to his Twitter account to slam Willis to his nearly 1 million followers.

Then Stallone got even more personal about Willis:

Stallone’s rep confirmed to The Huffington Post that the tweet was in fact made in reference to Willis, but refused to elaborate.

Willis was part of the first two hugely successful installment of the “Expendables” franchise, which grossed over half a billion dollars combined worldwide.

Production for “The Expendables 3” is set to begin later this month with Jackie Chan,Wesley Snipes, Nicolas Cage and Milla Jovovich joining the star-studded cast.

“New TEAM a Blessing! Best Group of the year,” Stallone tweeted in July. “EXPENDABLES Looking Fresh and Strong.”