diff --git a/y2023/vision/yolov5.h b/y2023/vision/yolov5.h
index ad04350..7e2a521 100644
--- a/y2023/vision/yolov5.h
+++ b/y2023/vision/yolov5.h
@@ -7,7 +7,6 @@
 #include <fstream>
 #include <iostream>
 #include <opencv2/core.hpp>
-#include <opencv2/dnn.hpp>
 #include <opencv2/highgui/highgui.hpp>
 #include <opencv2/imgcodecs.hpp>
 #include <opencv2/imgproc.hpp>
@@ -24,14 +23,14 @@
 
 class YOLOV5 {
  public:
-  virtual ~YOLOV5();
+  virtual ~YOLOV5() {}
 
   // Takes a model path as string and loads a pre-trained
   // YOLOv5 model from the specified path.
-  virtual void LoadModel(const std::string path);
+  virtual void LoadModel(const std::string path) = 0;
 
   // Takes an image and returns a Detection.
-  virtual std::vector<Detection> ProcessImage(cv::Mat image);
+  virtual std::vector<Detection> ProcessImage(cv::Mat image) = 0;
 };
 
 std::unique_ptr<YOLOV5> MakeYOLOV5();