Unity 5 no longer supports no kinematic rigid bodys with mesh colliders? Workaround?

Hello, I have a triangular prism(basically just a cube sliced in half diagonally) that the player should be able to move around and it has a rigid body for physics. I need to have a collider and a rididbody on it. I figured the best way to make the collider was with a mesh collider, but when I put it on the object and run the game unity says "Non-convex Mesh with Non-kinematic rigid body is no longer supported in Unity 5." Unity says I either have to make it kinematic or remove the rigid body". Kinematic means forces don't apply to the object right? So is there any way I can get around this problem. Thx.