diff --git a/src/language/languages.json b/src/language/languages.json
index bb3eab20296..def6179ae55 100644
--- a/src/language/languages.json
+++ b/src/language/languages.json
@@ -85,7 +85,7 @@
     "xml": {
         "name": "XML",
         "mode": "xml",
-        "fileExtensions": ["svg", "xml", "wxs", "wxl", "wsdl", "rss", "atom", "rdf", "xslt", "xul", "xbl", "mathml", "config", "plist"],
+        "fileExtensions": ["svg", "xml", "wxs", "wxl", "wsdl", "rss", "atom", "rdf", "xslt", "xsl", "xul", "xbl", "mathml", "config", "plist"],
         "blockComment": ["<!--", "-->"]
     },