diff --git a/y2019/image_streamer/flip_image.h b/y2019/image_streamer/flip_image.h
index 7c31774..6837fb7 100644
--- a/y2019/image_streamer/flip_image.h
+++ b/y2019/image_streamer/flip_image.h
@@ -1,8 +1,9 @@
 #ifndef Y2019_IMAGE_STREAMER_FLIP_IMAGE_H_
 #define Y2019_IMAGE_STREAMER_FLIP_IMAGE_H_
 
-#include <stddef.h>
-#include <stdio.h>
+#include <cstddef>
+#include <cstdio>
+
 #include "third_party/libjpeg/jerror.h"
 #include "third_party/libjpeg/jpeglib.h"