diff --git a/dom/webidl/Node.webidl b/dom/webidl/Node.webidl
index ba5e01a5b2c2..cc367adc093b 100644
--- a/dom/webidl/Node.webidl
+++ b/dom/webidl/Node.webidl
@@ -34,8 +34,6 @@ interface Node : EventTarget {
   [Pure]
   readonly attribute DOMString? baseURI;
 
-  [Pure, BinaryName=getComposedDoc]
-  readonly attribute boolean isConnected;
   [Pure]
   readonly attribute Document? ownerDocument;
   [Pure, Pref="dom.node.rootNode.enabled"]