diff --git a/sys/boot/forth/beastie.4th b/sys/boot/forth/beastie.4th
index 65d5fc03cf3f..1130ed04ec88 100644
--- a/sys/boot/forth/beastie.4th
+++ b/sys/boot/forth/beastie.4th
@@ -193,7 +193,7 @@ at-xy ."         `--{__________) "
 			then
 		else
 			menuidx @
-			1+ dup
+			1+
 			menuidx !
 			-2 bootacpikey !
 		then