diff --git a/cs658/final/util/Ray.h b/cs658/final/util/Ray.h
index 85367fd..19b7a75 100644
--- a/cs658/final/util/Ray.h
+++ b/cs658/final/util/Ray.h
@@ -9,8 +9,8 @@ class Ray
     public:
         Ray();
         Ray(const Vector & origin, const Vector & direction);
-        Vector getOrigin() const { return m_origin; }
-        Vector getDirection() const { return m_direction; }
+        Vector & getOrigin() { return m_origin; }
+        Vector & getDirection() { return m_direction; }
         Vector getPositionAt(double dist) const;
 
     private: