diff --git a/Extras/BulletColladaConverter/ColladaConverter.cpp b/Extras/BulletColladaConverter/ColladaConverter.cpp
index 0f522c803..4e214d554 100644
--- a/Extras/BulletColladaConverter/ColladaConverter.cpp
+++ b/Extras/BulletColladaConverter/ColladaConverter.cpp
@@ -1135,7 +1135,7 @@ void	ColladaConverter::prepareConstraints(ConstraintInput& input)
 	}
 }
 
-void	ColladaConverter::PreparePhysicsObject(struct btRigidBodyInput& input, bool isDynamics, float mass,btCollisionShape* colShape, btVector3 linearVelocity, btVector3 angularVelocity)
+void	ColladaConverter::PreparePhysicsObject(struct btRigidBodyInput& input, bool isDynamics, float mass,btCollisionShape* colShape, const btVector3& linearVelocity, const btVector3& angularVelocity)
 {
 	btTransform startTransform;
 	startTransform.setIdentity();
diff --git a/Extras/BulletColladaConverter/ColladaConverter.h b/Extras/BulletColladaConverter/ColladaConverter.h
index efe3b3244..b14ef73dd 100644
--- a/Extras/BulletColladaConverter/ColladaConverter.h
+++ b/Extras/BulletColladaConverter/ColladaConverter.h
@@ -99,7 +99,7 @@ protected:
 	bool	m_use32bitIndices;
 	bool	m_use4componentVertices;
 	
-	void PreparePhysicsObject(struct btRigidBodyInput& input, bool isDynamics, float mass,btCollisionShape* colShape, btVector3 linearVelocity, btVector3 angularVelocity);
+	void PreparePhysicsObject(struct btRigidBodyInput& input, bool isDynamics, float mass,btCollisionShape* colShape, const btVector3& linearVelocity, const btVector3& angularVelocity);
 	
 	void prepareConstraints(ConstraintInput& input);