diff --git a/gui/public/codemirror/mode/javascript/javascript.js b/gui/public/codemirror/mode/javascript/javascript.js
index 42b4b191f..6480a146f 100644
--- a/gui/public/codemirror/mode/javascript/javascript.js
+++ b/gui/public/codemirror/mode/javascript/javascript.js
@@ -119,7 +119,7 @@ CodeMirror.defineMode("javascript", function(config, parserConfig) {
           var kw = keywords[word]
           return ret(kw.type, kw.style, word)
         }
-        if (word == "async" && stream.match(/^(\s|\/\*.*?\*\/)*[\[\(\w]/, false))
+        if (word == "async" && stream.match(/^(\s|\/\*([^*]|\*(?!\/))*?\*\/)*[\[\(\w]/, false))
           return ret("async", "keyword", word)
       }
       return ret("variable", "variable", word)