diff --git a/lib/parse.js b/lib/parse.js
index e561ab67..48ab2167 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -255,7 +255,7 @@ function tokenizer($TEXT, filename) {
     };
 
     function token(type, value, is_comment) {
-        S.regex_allowed = ((type == "operator" && !UNARY_POSTFIX[value]) ||
+        S.regex_allowed = ((type == "operator" && !UNARY_POSTFIX(value)) ||
                            (type == "keyword" && KEYWORDS_BEFORE_EXPRESSION(value)) ||
                            (type == "punc" && PUNC_BEFORE_EXPRESSION(value)));
         var ret = {