diff --git a/Lib/xml/dom/minidom.py b/Lib/xml/dom/minidom.py
index 9c18fb2af3d..1b69fac9484 100644
--- a/Lib/xml/dom/minidom.py
+++ b/Lib/xml/dom/minidom.py
@@ -218,6 +218,13 @@ def cloneNode(self, deep):
                 clone.appendChild(child.cloneNode(1))
         return clone
 
+    # DOM Level 3 (Working Draft 2001-Jan-26)
+
+    def isSameNode(self, other):
+        return self is other
+
+    # minidom-specific API:
+
     def unlink(self):
         self.parentNode = None
         for child in self.childNodes: