diff --git a/lib/elixlsx/xml_templates.ex b/lib/elixlsx/xml_templates.ex
index 2d79c7a..e2c83e1 100644
--- a/lib/elixlsx/xml_templates.ex
+++ b/lib/elixlsx/xml_templates.ex
@@ -209,7 +209,7 @@ defmodule Elixlsx.XMLTemplates do
       :empty ->
         {:empty, :empty}
 
-      true ->
+      _ ->
         :error
     end
   end