diff --git a/18.rkt b/18.rkt
index fb5c433..ec97293 100644
--- a/18.rkt
+++ b/18.rkt
@@ -1,6 +1,6 @@
 #lang curly-fn racket
 
-(require "scripts/aoc.rkt" parser-tools/lex parser-tools/yacc (prefix-in : parser-tools/lex-sre))
+(require "scripts/aoc.rkt" parser-tools/lex parser-tools/yacc)
 
 ;; solution for day 18
 
@@ -14,7 +14,7 @@
     ["*" (token-*)]
     ["(" (token-lp)]
     [")" (token-rp)]
-    [(:+ (char-set "0123456789")) (token-number (string->number lexeme))]
+    [numeric (token-number (string->number lexeme))]
     [(eof) (token-eof)]))
 
 (define-simple-macro (make-oo-parser/precs needed-precs ...)