diff --git a/unix/xserver/hw/vnc/Input.cc b/unix/xserver/hw/vnc/Input.cc
index b23aeae..03d4019 100644
--- a/unix/xserver/hw/vnc/Input.cc
+++ b/unix/xserver/hw/vnc/Input.cc
@@ -524,6 +524,7 @@
 	{ XK_KP_7,		XK_7 },
 	{ XK_KP_8,		XK_8 },
 	{ XK_KP_9,		XK_9 },
+	{ XK_ISO_Level3_Shift,  XK_Mode_switch },
 };
 
 /*