diff --git a/lib/parse.js b/lib/parse.js
index 3493f8e6..3db7332d 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -497,7 +497,7 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
         try {
           return token("regexp", new RegExp(regexp, mods));
         } catch(e) {
-          parse_error(e.message);
+          parse_error("SyntaxError: " + e.message);
         }
     });