diff --git a/examples/testbed/tests/linear_motion.h b/examples/testbed/tests/linear_motion.h
index 967b0c0..cd70d40 100644
--- a/examples/testbed/tests/linear_motion.h
+++ b/examples/testbed/tests/linear_motion.h
@@ -27,6 +27,9 @@ public:
 		b3BodyDef bdef;
 		bdef.type = e_dynamicBody;
 		bdef.position.Set(0.0f, 0.0f, 0.0f);
+		bdef.fixedRotationX = true;
+		bdef.fixedRotationY = true;
+		bdef.fixedRotationZ = true;
 
 		m_body = m_world.CreateBody(bdef);
 
@@ -41,13 +44,6 @@ public:
 
 		m_body->CreateShape(sdef);
 
-		b3MassData data;
-		m_body->GetMassData(&data);
-
-		data.I.SetZero();
-
-		m_body->SetMassData(&data);
-
 		b3Vec3 g(0.0f, 0.0f, 0.0f);
 		m_world.SetGravity(g);