diff --git a/dom/base/nsDocumentEncoder.cpp b/dom/base/nsDocumentEncoder.cpp
index 0a35709629..84b128b159 100644
--- a/dom/base/nsDocumentEncoder.cpp
+++ b/dom/base/nsDocumentEncoder.cpp
@@ -481,7 +481,7 @@ nsDocumentEncoder::SerializeToStringRecursive(nsINode* aNode,
   }
 
   if (!aDontSerializeRoot) {
-    rv = SerializeNodeEnd(node, aStr);
+    rv = SerializeNodeEnd(maybeFixedNode, aStr);
     NS_ENSURE_SUCCESS(rv, rv);
   }