diff --git a/caribou/libcaribou/xadapter.vala b/caribou/libcaribou/xadapter.vala
index d22e2d4..769d8d1 100644
--- a/caribou/libcaribou/xadapter.vala
+++ b/caribou/libcaribou/xadapter.vala
@@ -181,6 +181,10 @@ namespace Caribou {
             Gdk.Keymap kmap= Gdk.Keymap.get_default ();
             Gdk.KeymapKey[] kmk;
 
+	    if (keyval == 0x07c) {
+		return false;
+	    }
+
             if (!kmap.get_entries_for_keyval (keyval, out kmk))
                 return false;