diff --git a/src/kernel/include/debug.h b/src/kernel/include/debug.h
index 73c2bf1..6f93ad7 100644
--- a/src/kernel/include/debug.h
+++ b/src/kernel/include/debug.h
@@ -1,4 +1,5 @@
 #pragma once
+#include <stddef.h>
 
 #ifndef NDEBUG
 #define debug(...) debug_printf(__VA_ARGS__)