diff --git a/src/main/build/debug.h b/src/main/build/debug.h
index 5476c5b7884..3f84e973551 100644
--- a/src/main/build/debug.h
+++ b/src/main/build/debug.h
@@ -21,6 +21,7 @@
 #pragma once
 
 #include <stdint.h>
+#include <stddef.h>
 
 #define DEBUG16_VALUE_COUNT 8
 extern int16_t debug[DEBUG16_VALUE_COUNT];