diff --git a/headers/private/app/ServerProtocol.h b/headers/private/app/ServerProtocol.h
index 66bb88ed60..ecc4b2df9b 100644
--- a/headers/private/app/ServerProtocol.h
+++ b/headers/private/app/ServerProtocol.h
@@ -259,6 +259,7 @@ AS_LAYER_DRAW_BITMAP_ASYNC_AT_POINT,
 AS_LAYER_DRAW_BITMAP_SYNC_IN_RECT,
 AS_LAYER_DRAW_BITMAP_SYNC_AT_POINT,
 AS_LAYER_SET_EVENT_MASK,
+AS_LAYER_SET_MOUSE_EVENT_MASK,
 
 AS_LAYER_DRAW_STRING,
 AS_LAYER_SET_CLIP_REGION,