diff --git a/xmldom/index.d.ts b/xmldom/index.d.ts
old mode 100644
new mode 100755
index dfbe34599c..8c252389cc
--- a/xmldom/index.d.ts
+++ b/xmldom/index.d.ts
@@ -7,6 +7,11 @@
 declare namespace xmldom {
     var DOMParser: DOMParserStatic;
     var XMLSerializer: XMLSerializerStatic;
+    var DOMImplementation: DOMImplementationStatic;
+
+    interface DOMImplementationStatic {
+        new(): DOMImplementation;
+    }
 
     interface DOMParserStatic {
         new (): DOMParser;