Puzzle "The red square"

Difficulty: Very Difficult
Goal: Put the 9 pieces into the box, including the red cube !
Dimensions: 11.5 x 8 x 7 cm

This is the story of a box filled with 8 pieces of wood, and a small red piece lying around that wants to join the group.

"There's no room!" yell the other wooden pieces, who are packed like sardines in their box.

And yet, and yet...There really is still room! Can you reposition the pieces in the box to help the little red on get in and warm up next to his buddies?