diff --git a/lib/sweet_xml.ex b/lib/sweet_xml.ex
index 8af1015..afedbaa 100644
--- a/lib/sweet_xml.ex
+++ b/lib/sweet_xml.ex
@@ -255,7 +255,7 @@ defmodule SweetXml do
   end
 
   def add_namespace(%SweetXpath{} = xpath, prefix, uri) do
-    %SweetXpath{
+    %{
       xpath
       | namespaces: [
           {to_charlist(prefix), to_charlist(uri)}