diff --git a/janet/scoundrel.janet b/janet/scoundrel.janet
index ba06208..2585e43 100644
--- a/janet/scoundrel.janet
+++ b/janet/scoundrel.janet
@@ -32,7 +32,7 @@
   (var valid false)
   (while (not valid)
     (set resp (get-choice prompt))
-    (set valid (case resp "y" true "n" true false)))
+    (set valid (string/check-set "yn" resp)))
   (= resp "y"))
 
 # data section
@@ -86,7 +86,7 @@
     (set valid (cond
         (= ch "r")
           (and (state :can-run) (not (state :engaged)))
-        (has-value? ["1" "2" "3" "4"] ch)
+        (string/check-set "1234" ch)
           (<= (scan-number ch) (length room))
         false)))
   ch)