diff --git a/src/HitRecord.h b/src/HitRecord.h
index 599db5a..7c13aa1 100644
--- a/src/HitRecord.h
+++ b/src/HitRecord.h
@@ -9,6 +9,8 @@ using Eigen::Vector3f;
 
 class HitRecord {
 public:
+  HitRecord()
+      : t(0), ray_(Ray()), normal_(Vector3f::Zero()), geometry_(nullptr) {}
   HitRecord(float t, const Ray &r, Geometry *g) : t(t), ray_(r), geometry_(g) {}
   bool operator<(const HitRecord &) const;
 
diff --git a/src/Ray.h b/src/Ray.h
index a344e5d..252952f 100644
--- a/src/Ray.h
+++ b/src/Ray.h
@@ -7,6 +7,7 @@ using Eigen::Vector3f;
 
 class Ray {
 public:
+  Ray() : origin_(Vector3f::Zero()), direction_(Vector3f::Zero()) {}
   Ray(const Vector3f &o, const Vector3f &d) : origin_(o), direction_(d) {}
 
 private: