diff --git a/kernel/trunk/gui/button.inc b/kernel/trunk/gui/button.inc
index bda7acf276..0d0515ac3c 100644
--- a/kernel/trunk/gui/button.inc
+++ b/kernel/trunk/gui/button.inc
@@ -25,6 +25,7 @@ struc SYS_BUTTON
   .top    dw ?
   .height dw ?
   .id_hi  dw ?
+  .align  dw ?
   .sizeof:
 }
 virtual at 0