diff --git a/report_wkhtmltopdf_param/models/report_paperformat.py b/report_wkhtmltopdf_param/models/report_paperformat.py
index ed5e427b23..0d74ce72fd 100644
--- a/report_wkhtmltopdf_param/models/report_paperformat.py
+++ b/report_wkhtmltopdf_param/models/report_paperformat.py
@@ -36,7 +36,7 @@ def _check_recursion_custom_params(self):
             report = self.env["ir.actions.report"].new(
                 {"paperformat_id": paperformat.id}
             )
-            content = report._run_wkhtmltopdf(sample_html)
+            content = report._run_wkhtmltopdf([sample_html])
             if not content:
                 raise ValidationError(
                     self.env._("Failed to create a PDF using the provided parameters.")