diff --git a/acorn.js b/acorn.js
index d84e3b3897..9201398d6f 100644
--- a/acorn.js
+++ b/acorn.js
@@ -700,7 +700,7 @@
     // of the type given by its first argument.
 
     case 47: // '/'
-      return readToken_slash(code);
+      return readToken_slash();
 
     case 37: case 42: // '%*'
       return readToken_mult_modulo();