diff --git a/beautiful-racket-demo/basic-demo/expander.rkt b/beautiful-racket-demo/basic-demo/expander.rkt
index 6391b8c..82ff395 100644
--- a/beautiful-racket-demo/basic-demo/expander.rkt
+++ b/beautiful-racket-demo/basic-demo/expander.rkt
@@ -22,7 +22,7 @@
 (struct change-line-signal (val))
 
 (define (b-end) (raise (end-program-signal)))
-(define (b-goto num-expr) (raise (change-line-signal num-expr)))
+(define (b-goto expr) (raise (change-line-signal expr)))
 
 (define (run line-table)
   (define line-vec