diff --git a/basis/ui/backend/x11/x11.factor b/basis/ui/backend/x11/x11.factor
index 7063a060db..49bf9083cd 100644
--- a/basis/ui/backend/x11/x11.factor
+++ b/basis/ui/backend/x11/x11.factor
@@ -107,6 +107,7 @@ CONSTANT: key-codes
     H{
         { 0xFF08 "BACKSPACE" }
         { 0xFF09 "TAB"       }
+        { 0xFE20 "TAB"       }
         { 0xFF0D "RET"       }
         { 0xFF8D "ENTER"     }
         { 0xFF1B "ESC"       }