diff --git a/vncviewer/OptionsDialog.h b/vncviewer/OptionsDialog.h
index d499469..9968331 100644
--- a/vncviewer/OptionsDialog.h
+++ b/vncviewer/OptionsDialog.h
@@ -105,6 +105,7 @@
   Fl_Check_Button *acceptClipboardCheckbox;
   Fl_Check_Button *sendClipboardCheckbox;
   Fl_Check_Button *sendPrimaryCheckbox;
+  Fl_Check_Button *systemKeysCheckbox;
   Fl_Choice *menuKeyChoice;
 
   /* Misc. */