diff --git a/content/base/src/nsDOMParser.cpp b/content/base/src/nsDOMParser.cpp
index 7316f483955..b982c896cdd 100644
--- a/content/base/src/nsDOMParser.cpp
+++ b/content/base/src/nsDOMParser.cpp
@@ -69,9 +69,6 @@ nsDOMParser::ParseFromString(const PRUnichar *str,
     rv = SetUpDocument(DocumentFlavorHTML, getter_AddRefs(domDocument));
     NS_ENSURE_SUCCESS(rv, rv);
     nsCOMPtr<nsIDocument> document = do_QueryInterface(domDocument);
-    nsDependentString sourceBuffer(str);
-    rv = nsContentUtils::ParseDocumentHTML(sourceBuffer, document, false);
-    NS_ENSURE_SUCCESS(rv, rv);
 
     // Keep the XULXBL state, base URL and principal setting in sync with the
     // XML case
@@ -85,6 +82,10 @@ nsDOMParser::ParseFromString(const PRUnichar *str,
     // And the right principal
     document->SetPrincipal(mPrincipal);
 
+    nsDependentString sourceBuffer(str);
+    rv = nsContentUtils::ParseDocumentHTML(sourceBuffer, document, false);
+    NS_ENSURE_SUCCESS(rv, rv);
+
     domDocument.forget(aResult);
     return rv;
   }