RigidBody2D rotation on y-axis not z-axis

I am converting my game in to using the 2D stuff in Unity and am having an issue applying torque to my RigidBody2D

rigidbody2D.AddTorque(1.0f);

Causes the object to rotate around the y-axis as opposed to the z-axis. Any ideas?

Being an idiot - object was rotated by 90 degrees.