diff --git a/handler.ts b/handler.ts
index b5bfa41..1bfd64f 100644
--- a/handler.ts
+++ b/handler.ts
@@ -20,7 +20,7 @@ const renderSheet = (date: Date) => {
 const makeHelpDialog = function* (
   transformOptions: Record<
     string,
-    (nextArgument: () => string | undefined) => void
+    unknown
   >,
   optionsLabels: Record<
     string,