diff --git a/lib/parse.js b/lib/parse.js
index b6645f49..a4b121c3 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -484,7 +484,7 @@ function tokenizer($TEXT, filename, html5_comments) {
         try {
           r = new RegExp(regexp, mods);
         } catch(e) {
-          parse_error("Invalid regular expression");
+          parse_error(e.message);
         }
         return token("regexp", r);
     });