diff --git a/y2020/joystick_reader.cc b/y2020/joystick_reader.cc
index 3e828cf..44d8a42 100644
--- a/y2020/joystick_reader.cc
+++ b/y2020/joystick_reader.cc
@@ -1,8 +1,9 @@
-#include <math.h>
-#include <stdio.h>
-#include <string.h>
 #include <unistd.h>
 
+#include <cmath>
+#include <cstdio>
+#include <cstring>
+
 #include "aos/actions/actions.h"
 #include "aos/init.h"
 #include "aos/logging/logging.h"