diff --git a/config.h b/config.h
index fc3d8c9..933fc4c 100644
--- a/config.h
+++ b/config.h
@@ -1,6 +1,8 @@
 #ifndef CONFIG_H
 #define CONFIG_H
 
+#include <stddef.h>
+
 // Keybinds
 #define    up_key 'k'
 #define  down_key 'j'
diff --git a/src/include/snake.h b/src/include/snake.h
index 734e76b..84cc75f 100644
--- a/src/include/snake.h
+++ b/src/include/snake.h
@@ -1,6 +1,8 @@
 #ifndef SNAKE_H
 #define SNAKE_H
 
+#include <stddef.h>
+
 #include "segment.h"
 #include "field.h"