diff --git a/vncviewer/parameters.h b/vncviewer/parameters.h
index 4fa989f..d7144a4 100644
--- a/vncviewer/parameters.h
+++ b/vncviewer/parameters.h
@@ -46,6 +46,7 @@
 #endif // HAVE_FLTK_FULLSCREEN_SCREENS
 #endif // HAVE_FLTK_FULLSCREEN
 extern rfb::StringParameter desktopSize;
+extern rfb::StringParameter geometry;
 extern rfb::BoolParameter remoteResize;
 
 extern rfb::BoolParameter viewOnly;