diff --git a/pmd-javascript/etc/grammar/Ecmascript5.jj b/pmd-javascript/etc/grammar/Ecmascript5.jj
index cd7cb8c5e8..a3194f1bd6 100644
--- a/pmd-javascript/etc/grammar/Ecmascript5.jj
+++ b/pmd-javascript/etc/grammar/Ecmascript5.jj
@@ -281,7 +281,8 @@ TOKEN :
     |
         [
           "$",
-          "_"
+          "_",
+          "@"
         ]
     |
         <UNICODE_ESCAPE_SEQUENCE>