diff --git a/Controllers/MountainKeyboardController/RGBController_MountainKeyboard.h b/Controllers/MountainKeyboardController/RGBController_MountainKeyboard.h
index d75860d14..61364fe0d 100644
--- a/Controllers/MountainKeyboardController/RGBController_MountainKeyboard.h
+++ b/Controllers/MountainKeyboardController/RGBController_MountainKeyboard.h
@@ -11,6 +11,7 @@
 
 #pragma once
 
+#include <cstring>
 #include "RGBController.h"
 #include "MountainKeyboardController.h"