diff --git a/vncviewer/OptionsDialog.h b/vncviewer/OptionsDialog.h
index c26c0c9..b3ac015 100644
--- a/vncviewer/OptionsDialog.h
+++ b/vncviewer/OptionsDialog.h
@@ -114,6 +114,7 @@
   Fl_Int_Input *desktopHeightInput;
   Fl_Check_Button *remoteResizeCheckbox;
   Fl_Check_Button *fullScreenCheckbox;
+  Fl_Check_Button *fullScreenAllMonitorsCheckbox;
 
   /* Misc. */
   Fl_Check_Button *sharedCheckbox;