diff --git a/arkui/window_manager/oh_window.h b/arkui/window_manager/oh_window.h
index 347d1000275db13023663a48045c143e2daa068f..6753d99d419f1efdfc21f0dd0e49178d09d8cc0e 100644
--- a/arkui/window_manager/oh_window.h
+++ b/arkui/window_manager/oh_window.h
@@ -37,6 +37,7 @@
 #include "stdbool.h"
 #include "stdint.h"
 
+#include <cstddef>
 #include "oh_window_comm.h"
 #include "multimodalinput/oh_input_manager.h"