diff --git a/src/beautifiers/prettydiff.coffee b/src/beautifiers/prettydiff.coffee
index ce99361..b0b44e0 100644
--- a/src/beautifiers/prettydiff.coffee
+++ b/src/beautifiers/prettydiff.coffee
@@ -69,7 +69,7 @@ module.exports = class PrettyDiff extends Beautifier
           lang = "handlebars"
         when "SGML"
           lang = "markup"
-        when "XML", "Visualforce", "SVG", "XSD", "XSL"
+        when "XML", "Visualforce", "SVG"
           lang = "xml"
         when "HTML"
           lang = "html"
diff --git a/src/languages/xml.coffee b/src/languages/xml.coffee
index 46fd74e..59845fd 100644
--- a/src/languages/xml.coffee
+++ b/src/languages/xml.coffee
@@ -9,7 +9,7 @@ module.exports = {
   Supported Grammars
   ###
   grammars: [
-    "XML"
+    "XML", "XSD", "XSL"
   ]
 
   ###