diff --git a/collects/mred/private/wx/gtk/keycode.rkt b/collects/mred/private/wx/gtk/keycode.rkt
index b5e7eb368a..ba967aeca0 100644
--- a/collects/mred/private/wx/gtk/keycode.rkt
+++ b/collects/mred/private/wx/gtk/keycode.rkt
@@ -18,6 +18,7 @@
          (#xff55 . prior)
          (#xff56 . next)
          (#xff57 . end)
+         (#xff63 . insert)
          (#xff80 . #\space) ; keypad
          (#xff89 . #\tab) ; keypad
          (#xff8d . #\u3)  ; enter